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| <h1 class="title">ALTER TABLE</h1> |
| |
| |
| <h3 id="description">Description</h3> |
| |
| <p><code class="language-plaintext highlighter-rouge">ALTER TABLE</code> statement changes the schema or properties of a table.</p> |
| |
| <h3 id="rename">RENAME</h3> |
| |
| <p><code class="language-plaintext highlighter-rouge">ALTER TABLE RENAME TO</code> statement changes the table name of an existing table in the database. The table rename command cannot be used to move a table between databases, only to rename a table within the same database.</p> |
| |
| <p>If the table is cached, the commands clear cached data of the table. The cache will be lazily filled when the next time the table is accessed. Additionally:</p> |
| <ul> |
| <li>the table rename command uncaches all table’s dependents such as views that refer to the table. The dependents should be cached again explicitly.</li> |
| <li>the partition rename command clears caches of all table dependents while keeping them as cached. So, their caches will be lazily filled when the next time they are accessed.</li> |
| </ul> |
| |
| <h4 id="syntax">Syntax</h4> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="k">RENAME</span> <span class="k">TO</span> <span class="n">table_identifier</span> |
| |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="n">partition_spec</span> <span class="k">RENAME</span> <span class="k">TO</span> <span class="n">partition_spec</span> |
| </code></pre></div></div> |
| |
| <h4 id="parameters">Parameters</h4> |
| |
| <ul> |
| <li> |
| <p><strong>table_identifier</strong></p> |
| |
| <p>Specifies a table name, which may be optionally qualified with a database name.</p> |
| |
| <p><strong>Syntax:</strong> <code class="language-plaintext highlighter-rouge">[ database_name. ] table_name</code></p> |
| </li> |
| <li> |
| <p><strong>partition_spec</strong></p> |
| |
| <p>Partition to be renamed. Note that one can use a typed literal (e.g., date’2019-01-02’) in the partition spec.</p> |
| |
| <p><strong>Syntax:</strong> <code class="language-plaintext highlighter-rouge">PARTITION ( partition_col_name = partition_col_val [ , ... ] )</code></p> |
| </li> |
| </ul> |
| |
| <h3 id="add-columns">ADD COLUMNS</h3> |
| |
| <p><code class="language-plaintext highlighter-rouge">ALTER TABLE ADD COLUMNS</code> statement adds mentioned columns to an existing table.</p> |
| |
| <h4 id="syntax-1">Syntax</h4> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="k">ADD</span> <span class="n">COLUMNS</span> <span class="p">(</span> <span class="n">col_spec</span> <span class="p">[</span> <span class="p">,</span> <span class="p">...</span> <span class="p">]</span> <span class="p">)</span> |
| </code></pre></div></div> |
| |
| <h4 id="parameters-1">Parameters</h4> |
| |
| <ul> |
| <li> |
| <p><strong>table_identifier</strong></p> |
| |
| <p>Specifies a table name, which may be optionally qualified with a database name.</p> |
| |
| <p><strong>Syntax:</strong> <code class="language-plaintext highlighter-rouge">[ database_name. ] table_name</code></p> |
| </li> |
| <li> |
| <p><strong>COLUMNS ( col_spec )</strong></p> |
| |
| <p>Specifies the columns to be added.</p> |
| </li> |
| </ul> |
| |
| <h3 id="drop-columns">DROP COLUMNS</h3> |
| |
| <p><code class="language-plaintext highlighter-rouge">ALTER TABLE DROP COLUMNS</code> statement drops mentioned columns from an existing table. |
| Note that this statement is only supported with v2 tables.</p> |
| |
| <h4 id="syntax-2">Syntax</h4> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="k">DROP</span> <span class="err">{</span> <span class="k">COLUMN</span> <span class="o">|</span> <span class="n">COLUMNS</span> <span class="err">}</span> <span class="p">[</span> <span class="p">(</span> <span class="p">]</span> <span class="n">col_name</span> <span class="p">[</span> <span class="p">,</span> <span class="p">...</span> <span class="p">]</span> <span class="p">[</span> <span class="p">)</span> <span class="p">]</span> |
| </code></pre></div></div> |
| |
| <h4 id="parameters-2">Parameters</h4> |
| |
| <ul> |
| <li> |
| <p><strong>table_identifier</strong></p> |
| |
| <p>Specifies a table name, which may be optionally qualified with a database name.</p> |
| |
| <p><strong>Syntax:</strong> <code class="language-plaintext highlighter-rouge">[ database_name. ] table_name</code></p> |
| </li> |
| <li> |
| <p><strong>col_name</strong></p> |
| |
| <p>Specifies the name of the column.</p> |
| </li> |
| </ul> |
| |
| <h3 id="rename-column">RENAME COLUMN</h3> |
| |
| <p><code class="language-plaintext highlighter-rouge">ALTER TABLE RENAME COLUMN</code> statement changes the column name of an existing table. |
| Note that this statement is only supported with v2 tables.</p> |
| |
| <h4 id="syntax-3">Syntax</h4> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="k">RENAME</span> <span class="k">COLUMN</span> <span class="n">col_name</span> <span class="k">TO</span> <span class="n">col_name</span> |
| </code></pre></div></div> |
| |
| <h4 id="parameters-3">Parameters</h4> |
| |
| <ul> |
| <li> |
| <p><strong>table_identifier</strong></p> |
| |
| <p>Specifies a table name, which may be optionally qualified with a database name.</p> |
| |
| <p><strong>Syntax:</strong> <code class="language-plaintext highlighter-rouge">[ database_name. ] table_name</code></p> |
| </li> |
| <li> |
| <p><strong>col_name</strong></p> |
| |
| <p>Specifies the name of the column.</p> |
| </li> |
| </ul> |
| |
| <h3 id="alter-or-change-column">ALTER OR CHANGE COLUMN</h3> |
| |
| <p><code class="language-plaintext highlighter-rouge">ALTER TABLE ALTER COLUMN</code> or <code class="language-plaintext highlighter-rouge">ALTER TABLE CHANGE COLUMN</code> statement changes column’s definition.</p> |
| |
| <h4 id="syntax-4">Syntax</h4> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="err">{</span> <span class="k">ALTER</span> <span class="o">|</span> <span class="n">CHANGE</span> <span class="err">}</span> <span class="p">[</span> <span class="k">COLUMN</span> <span class="p">]</span> <span class="n">col_name</span> <span class="n">alterColumnAction</span> |
| </code></pre></div></div> |
| |
| <h4 id="parameters-4">Parameters</h4> |
| |
| <ul> |
| <li> |
| <p><strong>table_identifier</strong></p> |
| |
| <p>Specifies a table name, which may be optionally qualified with a database name.</p> |
| |
| <p><strong>Syntax:</strong> <code class="language-plaintext highlighter-rouge">[ database_name. ] table_name</code></p> |
| </li> |
| <li> |
| <p><strong>col_name</strong></p> |
| |
| <p>Specifies the name of the column.</p> |
| </li> |
| <li> |
| <p><strong>alterColumnAction</strong></p> |
| |
| <p>Change column’s definition.</p> |
| </li> |
| </ul> |
| |
| <h3 id="replace-columns">REPLACE COLUMNS</h3> |
| |
| <p><code class="language-plaintext highlighter-rouge">ALTER TABLE REPLACE COLUMNS</code> statement removes all existing columns and adds the new set of columns. |
| Note that this statement is only supported with v2 tables.</p> |
| |
| <h4 id="syntax-5">Syntax</h4> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="p">[</span> <span class="n">partition_spec</span> <span class="p">]</span> <span class="k">REPLACE</span> <span class="n">COLUMNS</span> |
| <span class="p">[</span> <span class="p">(</span> <span class="p">]</span> <span class="n">qualified_col_type_with_position_list</span> <span class="p">[</span> <span class="p">)</span> <span class="p">]</span> |
| </code></pre></div></div> |
| |
| <h4 id="parameters-5">Parameters</h4> |
| |
| <ul> |
| <li> |
| <p><strong>table_identifier</strong></p> |
| |
| <p>Specifies a table name, which may be optionally qualified with a database name.</p> |
| |
| <p><strong>Syntax:</strong> <code class="language-plaintext highlighter-rouge">[ database_name. ] table_name</code></p> |
| </li> |
| <li> |
| <p><strong>partition_spec</strong></p> |
| |
| <p>Partition to be replaced. Note that one can use a typed literal (e.g., date’2019-01-02’) in the partition spec.</p> |
| |
| <p><strong>Syntax:</strong> <code class="language-plaintext highlighter-rouge">PARTITION ( partition_col_name = partition_col_val [ , ... ] )</code></p> |
| </li> |
| <li> |
| <p><strong>qualified_col_type_with_position_list</strong></p> |
| |
| <p>The list of the column(s) to be added</p> |
| |
| <p><strong>Syntax:</strong> <code class="language-plaintext highlighter-rouge">col_name col_type [ col_comment ] [ col_position ] [ , ... ]</code></p> |
| </li> |
| </ul> |
| |
| <h3 id="add-and-drop-partition">ADD AND DROP PARTITION</h3> |
| |
| <h4 id="add-partition">ADD PARTITION</h4> |
| |
| <p><code class="language-plaintext highlighter-rouge">ALTER TABLE ADD</code> statement adds partition to the partitioned table.</p> |
| |
| <p>If the table is cached, the command clears cached data of the table and all its dependents that refer to it. The cache will be lazily filled when the next time the table or the dependents are accessed.</p> |
| |
| <h5 id="syntax-6">Syntax</h5> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="k">ADD</span> <span class="p">[</span><span class="n">IF</span> <span class="k">NOT</span> <span class="k">EXISTS</span><span class="p">]</span> |
| <span class="p">(</span> <span class="n">partition_spec</span> <span class="p">[</span> <span class="n">partition_spec</span> <span class="p">...</span> <span class="p">]</span> <span class="p">)</span> |
| </code></pre></div></div> |
| |
| <h5 id="parameters-6">Parameters</h5> |
| |
| <ul> |
| <li> |
| <p><strong>table_identifier</strong></p> |
| |
| <p>Specifies a table name, which may be optionally qualified with a database name.</p> |
| |
| <p><strong>Syntax:</strong> <code class="language-plaintext highlighter-rouge">[ database_name. ] table_name</code></p> |
| </li> |
| <li> |
| <p><strong>partition_spec</strong></p> |
| |
| <p>Partition to be added. Note that one can use a typed literal (e.g., date’2019-01-02’) in the partition spec.</p> |
| |
| <p><strong>Syntax:</strong> <code class="language-plaintext highlighter-rouge">PARTITION ( partition_col_name = partition_col_val [ , ... ] )</code></p> |
| </li> |
| </ul> |
| |
| <h4 id="drop-partition">DROP PARTITION</h4> |
| |
| <p><code class="language-plaintext highlighter-rouge">ALTER TABLE DROP</code> statement drops the partition of the table.</p> |
| |
| <p>If the table is cached, the command clears cached data of the table and all its dependents that refer to it. The cache will be lazily filled when the next time the table or the dependents are accessed.</p> |
| |
| <h5 id="syntax-7">Syntax</h5> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="k">DROP</span> <span class="p">[</span> <span class="n">IF</span> <span class="k">EXISTS</span> <span class="p">]</span> <span class="n">partition_spec</span> <span class="p">[</span><span class="n">PURGE</span><span class="p">]</span> |
| </code></pre></div></div> |
| |
| <h5 id="parameters-7">Parameters</h5> |
| |
| <ul> |
| <li> |
| <p><strong>table_identifier</strong></p> |
| |
| <p>Specifies a table name, which may be optionally qualified with a database name.</p> |
| |
| <p><strong>Syntax:</strong> <code class="language-plaintext highlighter-rouge">[ database_name. ] table_name</code></p> |
| </li> |
| <li> |
| <p><strong>partition_spec</strong></p> |
| |
| <p>Partition to be dropped. Note that one can use a typed literal (e.g., date’2019-01-02’) in the partition spec.</p> |
| |
| <p><strong>Syntax:</strong> <code class="language-plaintext highlighter-rouge">PARTITION ( partition_col_name = partition_col_val [ , ... ] )</code></p> |
| </li> |
| </ul> |
| |
| <h3 id="set-and-unset">SET AND UNSET</h3> |
| |
| <h4 id="set-table-properties">SET TABLE PROPERTIES</h4> |
| |
| <p><code class="language-plaintext highlighter-rouge">ALTER TABLE SET</code> command is used for setting the table properties. If a particular property was already set, |
| this overrides the old value with the new one.</p> |
| |
| <p><code class="language-plaintext highlighter-rouge">ALTER TABLE UNSET</code> is used to drop the table property.</p> |
| |
| <h5 id="syntax-8">Syntax</h5> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c1">-- Set Table Properties </span> |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="k">SET</span> <span class="n">TBLPROPERTIES</span> <span class="p">(</span> <span class="n">key1</span> <span class="o">=</span> <span class="n">val1</span><span class="p">,</span> <span class="n">key2</span> <span class="o">=</span> <span class="n">val2</span><span class="p">,</span> <span class="p">...</span> <span class="p">)</span> |
| |
| <span class="c1">-- Unset Table Properties</span> |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="n">UNSET</span> <span class="n">TBLPROPERTIES</span> <span class="p">[</span> <span class="n">IF</span> <span class="k">EXISTS</span> <span class="p">]</span> <span class="p">(</span> <span class="n">key1</span><span class="p">,</span> <span class="n">key2</span><span class="p">,</span> <span class="p">...</span> <span class="p">)</span> |
| </code></pre></div></div> |
| |
| <h4 id="set-serde">SET SERDE</h4> |
| |
| <p><code class="language-plaintext highlighter-rouge">ALTER TABLE SET</code> command is used for setting the SERDE or SERDE properties in Hive tables. If a particular property was already set, this overrides the old value with the new one.</p> |
| |
| <h5 id="syntax-9">Syntax</h5> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c1">-- Set SERDE Properties</span> |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="p">[</span> <span class="n">partition_spec</span> <span class="p">]</span> |
| <span class="k">SET</span> <span class="n">SERDEPROPERTIES</span> <span class="p">(</span> <span class="n">key1</span> <span class="o">=</span> <span class="n">val1</span><span class="p">,</span> <span class="n">key2</span> <span class="o">=</span> <span class="n">val2</span><span class="p">,</span> <span class="p">...</span> <span class="p">)</span> |
| |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="p">[</span> <span class="n">partition_spec</span> <span class="p">]</span> <span class="k">SET</span> <span class="n">SERDE</span> <span class="n">serde_class_name</span> |
| <span class="p">[</span> <span class="k">WITH</span> <span class="n">SERDEPROPERTIES</span> <span class="p">(</span> <span class="n">key1</span> <span class="o">=</span> <span class="n">val1</span><span class="p">,</span> <span class="n">key2</span> <span class="o">=</span> <span class="n">val2</span><span class="p">,</span> <span class="p">...</span> <span class="p">)</span> <span class="p">]</span> |
| </code></pre></div></div> |
| |
| <h4 id="set-location-and-set-file-format">SET LOCATION And SET FILE FORMAT</h4> |
| |
| <p><code class="language-plaintext highlighter-rouge">ALTER TABLE SET</code> command can also be used for changing the file location and file format for |
| existing tables.</p> |
| |
| <p>If the table is cached, the <code class="language-plaintext highlighter-rouge">ALTER TABLE .. SET LOCATION</code> command clears cached data of the table and all its dependents that refer to it. The cache will be lazily filled when the next time the table or the dependents are accessed.</p> |
| |
| <h5 id="syntax-10">Syntax</h5> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c1">-- Changing File Format</span> |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="p">[</span> <span class="n">partition_spec</span> <span class="p">]</span> <span class="k">SET</span> <span class="n">FILEFORMAT</span> <span class="n">file_format</span> |
| |
| <span class="c1">-- Changing File Location</span> |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="p">[</span> <span class="n">partition_spec</span> <span class="p">]</span> <span class="k">SET</span> <span class="k">LOCATION</span> <span class="s1">'new_location'</span> |
| </code></pre></div></div> |
| |
| <h4 id="parameters-8">Parameters</h4> |
| |
| <ul> |
| <li> |
| <p><strong>table_identifier</strong></p> |
| |
| <p>Specifies a table name, which may be optionally qualified with a database name.</p> |
| |
| <p><strong>Syntax:</strong> <code class="language-plaintext highlighter-rouge">[ database_name. ] table_name</code></p> |
| </li> |
| <li> |
| <p><strong>partition_spec</strong></p> |
| |
| <p>Specifies the partition on which the property has to be set. Note that one can use a typed literal (e.g., date’2019-01-02’) in the partition spec.</p> |
| |
| <p><strong>Syntax:</strong> <code class="language-plaintext highlighter-rouge">PARTITION ( partition_col_name = partition_col_val [ , ... ] )</code></p> |
| </li> |
| <li> |
| <p><strong>SERDEPROPERTIES ( key1 = val1, key2 = val2, … )</strong></p> |
| |
| <p>Specifies the SERDE properties to be set.</p> |
| </li> |
| </ul> |
| |
| <h3 id="recover-partitions">RECOVER PARTITIONS</h3> |
| |
| <p><code class="language-plaintext highlighter-rouge">ALTER TABLE RECOVER PARTITIONS</code> statement recovers all the partitions in the directory of a table and updates the Hive metastore. |
| Another way to recover partitions is to use <code class="language-plaintext highlighter-rouge">MSCK REPAIR TABLE</code>.</p> |
| |
| <h4 id="syntax-11">Syntax</h4> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">table_identifier</span> <span class="n">RECOVER</span> <span class="n">PARTITIONS</span> |
| </code></pre></div></div> |
| |
| <h4 id="parameters-9">Parameters</h4> |
| |
| <ul> |
| <li> |
| <p><strong>table_identifier</strong></p> |
| |
| <p>Specifies a table name, which may be optionally qualified with a database name.</p> |
| |
| <p><strong>Syntax:</strong> <code class="language-plaintext highlighter-rouge">[ database_name. ] table_name</code></p> |
| </li> |
| </ul> |
| |
| <h3 id="examples">Examples</h3> |
| |
| <div class="language-sql highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c1">-- RENAME table </span> |
| <span class="k">DESC</span> <span class="n">student</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">name</span><span class="o">|</span> <span class="n">string</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">rollno</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|#</span> <span class="n">Partition</span> <span class="n">Information</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="o">#</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">Student</span> <span class="k">RENAME</span> <span class="k">TO</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| |
| <span class="c1">-- After Renaming the table</span> |
| <span class="k">DESC</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">name</span><span class="o">|</span> <span class="n">string</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">rollno</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|#</span> <span class="n">Partition</span> <span class="n">Information</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="o">#</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| |
| <span class="c1">-- RENAME partition</span> |
| |
| <span class="k">SHOW</span> <span class="n">PARTITIONS</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| <span class="o">|</span><span class="n">partition</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">10</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">11</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">12</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="k">default</span><span class="p">.</span><span class="n">StudentInfo</span> <span class="n">PARTITION</span> <span class="p">(</span><span class="n">age</span><span class="o">=</span><span class="s1">'10'</span><span class="p">)</span> <span class="k">RENAME</span> <span class="k">TO</span> <span class="n">PARTITION</span> <span class="p">(</span><span class="n">age</span><span class="o">=</span><span class="s1">'15'</span><span class="p">);</span> |
| |
| <span class="c1">-- After renaming Partition</span> |
| <span class="k">SHOW</span> <span class="n">PARTITIONS</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| <span class="o">|</span><span class="n">partition</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">11</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">12</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">15</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| |
| <span class="c1">-- Add new columns to a table</span> |
| <span class="k">DESC</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">name</span><span class="o">|</span> <span class="n">string</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">rollno</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|#</span> <span class="n">Partition</span> <span class="n">Information</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="o">#</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">StudentInfo</span> <span class="k">ADD</span> <span class="n">columns</span> <span class="p">(</span><span class="n">LastName</span> <span class="n">string</span><span class="p">,</span> <span class="n">DOB</span> <span class="nb">timestamp</span><span class="p">);</span> |
| |
| <span class="c1">-- After Adding New columns to the table</span> |
| <span class="k">DESC</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">name</span><span class="o">|</span> <span class="n">string</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">rollno</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">LastName</span><span class="o">|</span> <span class="n">string</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">DOB</span><span class="o">|</span><span class="nb">timestamp</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|#</span> <span class="n">Partition</span> <span class="n">Information</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="o">#</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| |
| <span class="c1">-- Drop columns of a table</span> |
| <span class="k">DESC</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">name</span><span class="o">|</span> <span class="n">string</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">rollno</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">LastName</span><span class="o">|</span> <span class="n">string</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">DOB</span><span class="o">|</span><span class="nb">timestamp</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|#</span> <span class="n">Partition</span> <span class="n">Information</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="o">#</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">StudentInfo</span> <span class="k">DROP</span> <span class="n">columns</span> <span class="p">(</span><span class="n">LastName</span><span class="p">,</span> <span class="n">DOB</span><span class="p">);</span> |
| |
| <span class="c1">-- After dropping columns of the table</span> |
| <span class="k">DESC</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">name</span><span class="o">|</span> <span class="n">string</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">rollno</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|#</span> <span class="n">Partition</span> <span class="n">Information</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="o">#</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| |
| <span class="c1">-- Rename a column of a table</span> |
| <span class="k">DESC</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">name</span><span class="o">|</span> <span class="n">string</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">rollno</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|#</span> <span class="n">Partition</span> <span class="n">Information</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="o">#</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">StudentInfo</span> <span class="k">RENAME</span> <span class="k">COLUMN</span> <span class="n">name</span> <span class="k">TO</span> <span class="n">FirstName</span><span class="p">;</span> |
| |
| <span class="c1">-- After renaming a column of the table</span> |
| <span class="k">DESC</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">FirstName</span><span class="o">|</span> <span class="n">string</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">rollno</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|#</span> <span class="n">Partition</span> <span class="n">Information</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="o">#</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| |
| <span class="c1">-- ALTER OR CHANGE COLUMNS</span> |
| <span class="k">DESC</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| <span class="o">|</span> <span class="n">FirstName</span><span class="o">|</span> <span class="n">string</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">rollno</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|#</span> <span class="n">Partition</span> <span class="n">Information</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="o">#</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span><span class="k">comment</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-------+</span> |
| |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">StudentInfo</span> <span class="k">ALTER</span> <span class="k">COLUMN</span> <span class="n">FirstName</span> <span class="k">COMMENT</span> <span class="nv">"new comment"</span><span class="p">;</span> |
| |
| <span class="c1">-- After ALTER or CHANGE COLUMNS</span> |
| <span class="k">DESC</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-----------+</span> |
| <span class="o">|</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span> <span class="k">comment</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-----------+</span> |
| <span class="o">|</span> <span class="n">FirstName</span><span class="o">|</span> <span class="n">string</span><span class="o">|</span><span class="k">new</span> <span class="k">comment</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">rollno</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|#</span> <span class="n">Partition</span> <span class="n">Information</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="o">#</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span> <span class="k">comment</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-----------+</span> |
| |
| <span class="c1">-- REPLACE COLUMNS</span> |
| <span class="k">DESC</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-----------+</span> |
| <span class="o">|</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span> <span class="k">comment</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-----------+</span> |
| <span class="o">|</span> <span class="n">FirstName</span><span class="o">|</span> <span class="n">string</span><span class="o">|</span><span class="k">new</span> <span class="k">comment</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">rollno</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|#</span> <span class="n">Partition</span> <span class="n">Information</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span> <span class="o">#</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span> <span class="k">comment</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">-----------------------+---------+-----------+</span> |
| |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">StudentInfo</span> <span class="k">REPLACE</span> <span class="n">COLUMNS</span> <span class="p">(</span><span class="n">name</span> <span class="n">string</span><span class="p">,</span> <span class="n">ID</span> <span class="nb">int</span> <span class="k">COMMENT</span> <span class="s1">'new comment'</span><span class="p">);</span> |
| |
| <span class="c1">-- After replacing COLUMNS</span> |
| <span class="k">DESC</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">-----=---------+---------+-----------+</span> |
| <span class="o">|</span> <span class="n">col_name</span><span class="o">|</span><span class="n">data_type</span><span class="o">|</span> <span class="k">comment</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------------+---------+-----------+</span> |
| <span class="o">|</span> <span class="n">name</span><span class="o">|</span> <span class="n">string</span><span class="o">|</span> <span class="k">NULL</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">ID</span><span class="o">|</span> <span class="nb">int</span><span class="o">|</span><span class="k">new</span> <span class="k">comment</span><span class="o">|</span> |
| <span class="o">|</span> <span class="o">#</span> <span class="n">Partitioning</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span><span class="k">Not</span> <span class="n">partitioned</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------------+---------+-----------+</span> |
| |
| <span class="c1">-- Add a new partition to a table </span> |
| <span class="k">SHOW</span> <span class="n">PARTITIONS</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| <span class="o">|</span><span class="n">partition</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">11</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">12</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">15</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">StudentInfo</span> <span class="k">ADD</span> <span class="n">IF</span> <span class="k">NOT</span> <span class="k">EXISTS</span> <span class="n">PARTITION</span> <span class="p">(</span><span class="n">age</span><span class="o">=</span><span class="mi">18</span><span class="p">);</span> |
| |
| <span class="c1">-- After adding a new partition to the table</span> |
| <span class="k">SHOW</span> <span class="n">PARTITIONS</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| <span class="o">|</span><span class="n">partition</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">11</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">12</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">15</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">18</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| |
| <span class="c1">-- Drop a partition from the table </span> |
| <span class="k">SHOW</span> <span class="n">PARTITIONS</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| <span class="o">|</span><span class="n">partition</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">11</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">12</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">15</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">18</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">StudentInfo</span> <span class="k">DROP</span> <span class="n">IF</span> <span class="k">EXISTS</span> <span class="n">PARTITION</span> <span class="p">(</span><span class="n">age</span><span class="o">=</span><span class="mi">18</span><span class="p">);</span> |
| |
| <span class="c1">-- After dropping the partition of the table</span> |
| <span class="k">SHOW</span> <span class="n">PARTITIONS</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| <span class="o">|</span><span class="n">partition</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">11</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">12</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">15</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| |
| <span class="c1">-- Adding multiple partitions to the table</span> |
| <span class="k">SHOW</span> <span class="n">PARTITIONS</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| <span class="o">|</span><span class="n">partition</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">11</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">12</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">15</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">StudentInfo</span> <span class="k">ADD</span> <span class="n">IF</span> <span class="k">NOT</span> <span class="k">EXISTS</span> <span class="n">PARTITION</span> <span class="p">(</span><span class="n">age</span><span class="o">=</span><span class="mi">18</span><span class="p">)</span> <span class="n">PARTITION</span> <span class="p">(</span><span class="n">age</span><span class="o">=</span><span class="mi">20</span><span class="p">);</span> |
| |
| <span class="c1">-- After adding multiple partitions to the table</span> |
| <span class="k">SHOW</span> <span class="n">PARTITIONS</span> <span class="n">StudentInfo</span><span class="p">;</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| <span class="o">|</span><span class="n">partition</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">11</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">12</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">15</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">18</span><span class="o">|</span> |
| <span class="o">|</span> <span class="n">age</span><span class="o">=</span><span class="mi">20</span><span class="o">|</span> |
| <span class="o">+</span><span class="c1">---------+</span> |
| |
| <span class="c1">-- Change the fileformat</span> |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">loc_orc</span> <span class="k">SET</span> <span class="n">fileformat</span> <span class="n">orc</span><span class="p">;</span> |
| |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">p1</span> <span class="n">partition</span> <span class="p">(</span><span class="k">month</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="k">day</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span> <span class="k">SET</span> <span class="n">fileformat</span> <span class="n">parquet</span><span class="p">;</span> |
| |
| <span class="c1">-- Change the file Location</span> |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">dbx</span><span class="p">.</span><span class="n">tab1</span> <span class="n">PARTITION</span> <span class="p">(</span><span class="n">a</span><span class="o">=</span><span class="s1">'1'</span><span class="p">,</span> <span class="n">b</span><span class="o">=</span><span class="s1">'2'</span><span class="p">)</span> <span class="k">SET</span> <span class="k">LOCATION</span> <span class="s1">'/path/to/part/ways'</span> |
| |
| <span class="c1">-- SET SERDE/ SERDE Properties</span> |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">test_tab</span> <span class="k">SET</span> <span class="n">SERDE</span> <span class="s1">'org.apache.hadoop.hive.serde2.columnar.LazyBinaryColumnarSerDe'</span><span class="p">;</span> |
| |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">dbx</span><span class="p">.</span><span class="n">tab1</span> <span class="k">SET</span> <span class="n">SERDE</span> <span class="s1">'org.apache.hadoop'</span> <span class="k">WITH</span> <span class="n">SERDEPROPERTIES</span> <span class="p">(</span><span class="s1">'k'</span> <span class="o">=</span> <span class="s1">'v'</span><span class="p">,</span> <span class="s1">'kay'</span> <span class="o">=</span> <span class="s1">'vee'</span><span class="p">)</span> |
| |
| <span class="c1">-- SET TABLE PROPERTIES</span> |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">dbx</span><span class="p">.</span><span class="n">tab1</span> <span class="k">SET</span> <span class="n">TBLPROPERTIES</span> <span class="p">(</span><span class="s1">'winner'</span> <span class="o">=</span> <span class="s1">'loser'</span><span class="p">);</span> |
| |
| <span class="c1">-- SET TABLE COMMENT Using SET PROPERTIES</span> |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">dbx</span><span class="p">.</span><span class="n">tab1</span> <span class="k">SET</span> <span class="n">TBLPROPERTIES</span> <span class="p">(</span><span class="s1">'comment'</span> <span class="o">=</span> <span class="s1">'A table comment.'</span><span class="p">);</span> |
| |
| <span class="c1">-- Alter TABLE COMMENT Using SET PROPERTIES</span> |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">dbx</span><span class="p">.</span><span class="n">tab1</span> <span class="k">SET</span> <span class="n">TBLPROPERTIES</span> <span class="p">(</span><span class="s1">'comment'</span> <span class="o">=</span> <span class="s1">'This is a new comment.'</span><span class="p">);</span> |
| |
| <span class="c1">-- DROP TABLE PROPERTIES</span> |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">dbx</span><span class="p">.</span><span class="n">tab1</span> <span class="n">UNSET</span> <span class="n">TBLPROPERTIES</span> <span class="p">(</span><span class="s1">'winner'</span><span class="p">);</span> |
| |
| <span class="c1">-- RECOVER PARTITIONS</span> |
| <span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">dbx</span><span class="p">.</span><span class="n">tab1</span> <span class="n">RECOVER</span> <span class="n">PARTITIONS</span><span class="p">;</span> |
| </code></pre></div></div> |
| |
| <h3 id="related-statements">Related Statements</h3> |
| |
| <ul> |
| <li><a href="sql-ref-syntax-ddl-create-table.html">CREATE TABLE</a></li> |
| <li><a href="sql-ref-syntax-ddl-drop-table.html">DROP TABLE</a></li> |
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