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| <h1 class="title">ALTER VIEW</h1> |
| |
| |
| <h3 id="description">Description</h3> |
| |
| <p>The <code class="highlighter-rouge">ALTER VIEW</code> statement can alter metadata associated with the view. It can change the definition of the view, change |
| the name of a view to a different name, set and unset the metadata of the view by setting <code class="highlighter-rouge">TBLPROPERTIES</code>.</p> |
| |
| <h4 id="rename-view">RENAME View</h4> |
| <p>Renames the existing view. If the new view name already exists in the source database, a <code class="highlighter-rouge">TableAlreadyExistsException</code> is thrown. This operation |
| does not support moving the views across databases.</p> |
| |
| <h4 id="syntax">Syntax</h4> |
| |
| <figure class="highlight"><pre><code class="language-sql" data-lang="sql"><span class="k">ALTER</span> <span class="k">VIEW</span> <span class="n">view_identifier</span> <span class="k">RENAME</span> <span class="k">TO</span> <span class="n">view_identifier</span></code></pre></figure> |
| |
| <h4 id="parameters">Parameters</h4> |
| <dl> |
| <dt><code><em>view_identifier</em></code></dt> |
| <dd> |
| Specifies a view name, which may be optionally qualified with a database name.<br /><br /> |
| <b> Syntax:</b> |
| <code> |
| [ database_name. ] view_name |
| </code> |
| </dd> |
| </dl> |
| |
| <h4 id="set-view-properties">SET View Properties</h4> |
| <p>Set one or more properties of an existing view. The properties are the key value pairs. If the properties’ keys exist, |
| the values are replaced with the new values. If the properties’ keys do not exist, the key value pairs are added into |
| the properties.</p> |
| |
| <h4 id="syntax-1">Syntax</h4> |
| |
| <figure class="highlight"><pre><code class="language-sql" data-lang="sql"><span class="k">ALTER</span> <span class="k">VIEW</span> <span class="n">view_identifier</span> <span class="k">SET</span> <span class="n">TBLPROPERTIES</span> <span class="p">(</span> <span class="n">property_key</span> <span class="o">=</span> <span class="n">property_val</span> <span class="p">[</span> <span class="p">,</span> <span class="p">...</span> <span class="p">]</span> <span class="p">)</span></code></pre></figure> |
| |
| <h4 id="parameters-1">Parameters</h4> |
| <dl> |
| <dt><code><em>view_identifier</em></code></dt> |
| <dd> |
| Specifies a view name, which may be optionally qualified with a database name.<br /><br /> |
| <b> Syntax:</b> |
| <code> |
| [ database_name. ] view_name |
| </code> |
| </dd> |
| <dt><code><em>property_key</em></code></dt> |
| <dd> |
| Specifies the property key. The key may consists of multiple parts separated by dot.<br /><br /> |
| <b>Syntax:</b> |
| <code> |
| [ key_part1 ] [ .key_part2 ] [ ... ] |
| </code> |
| </dd> |
| </dl> |
| |
| <h4 id="unset-view-properties">UNSET View Properties</h4> |
| <p>Drop one or more properties of an existing view. If the specified keys do not exist, an exception is thrown. Use |
| <code class="highlighter-rouge">IF EXISTS</code> to avoid the exception.</p> |
| |
| <h4 id="syntax-2">Syntax</h4> |
| |
| <figure class="highlight"><pre><code class="language-sql" data-lang="sql"><span class="k">ALTER</span> <span class="k">VIEW</span> <span class="n">view_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">property_key</span> <span class="p">[</span> <span class="p">,</span> <span class="p">...</span> <span class="p">]</span> <span class="p">)</span></code></pre></figure> |
| |
| <h4 id="parameters-2">Parameters</h4> |
| <dl> |
| <dt><code><em>view_identifier</em></code></dt> |
| <dd> |
| Specifies a view name, which may be optionally qualified with a database name.<br /><br /> |
| <b> Syntax:</b> |
| <code> |
| [ database_name. ] view_name |
| </code> |
| </dd> |
| <dt><code><em>property_key</em></code></dt> |
| <dd> |
| Specifies the property key. The key may consists of multiple parts separated by dot.<br /><br /> |
| <b>Syntax:</b> |
| <code> |
| [ key_part1 ] [ .key_part2 ] [ ... ] |
| </code> |
| </dd> |
| </dl> |
| |
| <h4 id="alter-view-as-select">ALTER View AS SELECT</h4> |
| <p><code class="highlighter-rouge">ALTER VIEW view_identifier AS SELECT</code> statement changes the definition of a view, the <code class="highlighter-rouge">SELECT</code> statement must be valid, |
| and the <code class="highlighter-rouge">view_identifier</code> must exist.</p> |
| |
| <h4 id="syntax-3">Syntax</h4> |
| |
| <figure class="highlight"><pre><code class="language-sql" data-lang="sql"><span class="k">ALTER</span> <span class="k">VIEW</span> <span class="n">view_identifier</span> <span class="k">AS</span> <span class="n">select_statement</span></code></pre></figure> |
| |
| <h4 id="parameters-3">Parameters</h4> |
| <dl> |
| <dt><code><em>view_identifier</em></code></dt> |
| <dd> |
| Specifies a view name, which may be optionally qualified with a database name.<br /><br /> |
| <b> Syntax:</b> |
| <code> |
| [ database_name. ] view_name |
| </code> |
| </dd> |
| <dt><code><em>select_statement</em></code></dt> |
| <dd> |
| Specifies the definition of the view, detail check <a href="sql-ref-syntax-qry-select.html">select_statement</a> |
| </dd> |
| </dl> |
| |
| <h3 id="examples">Examples</h3> |
| |
| <figure class="highlight"><pre><code class="language-sql" data-lang="sql"><span class="c1">-- Rename only changes the view name.</span> |
| <span class="c1">-- The source and target databases of the view have to be the same.</span> |
| <span class="c1">-- Use qualified or unqualified name for the source and target view </span> |
| <span class="k">ALTER</span> <span class="k">VIEW</span> <span class="n">tempdb1</span><span class="p">.</span><span class="n">v1</span> <span class="k">RENAME</span> <span class="k">TO</span> <span class="n">tempdb1</span><span class="p">.</span><span class="n">v2</span><span class="p">;</span> |
| |
| <span class="c1">-- Verify that the new view is created.</span> |
| <span class="k">DESCRIBE</span> <span class="k">TABLE</span> <span class="n">EXTENDED</span> <span class="n">tempdb1</span><span class="p">.</span><span class="n">v2</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">c1</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">c2</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="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|#</span> <span class="n">Detailed</span> <span class="k">Table</span> <span class="n">Information</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span><span class="k">Database</span> <span class="o">|</span><span class="n">tempdb1</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span><span class="k">Table</span> <span class="o">|</span><span class="n">v2</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">+</span><span class="c1">----------------------------+----------+-------+</span> |
| |
| <span class="c1">-- Before ALTER VIEW SET TBLPROPERTIES</span> |
| <span class="k">DESC</span> <span class="k">TABLE</span> <span class="n">EXTENDED</span> <span class="n">tempdb1</span><span class="p">.</span><span class="n">v2</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">c1</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">c2</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="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|#</span> <span class="n">Detailed</span> <span class="k">Table</span> <span class="n">Information</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span><span class="k">Database</span> <span class="o">|</span><span class="n">tempdb1</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span><span class="k">Table</span> <span class="o">|</span><span class="n">v2</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span><span class="k">Table</span> <span class="n">Properties</span> <span class="o">|</span><span class="p">[....]</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">+</span><span class="c1">----------------------------+----------+-------+</span> |
| |
| <span class="c1">-- Set properties in TBLPROPERTIES</span> |
| <span class="k">ALTER</span> <span class="k">VIEW</span> <span class="n">tempdb1</span><span class="p">.</span><span class="n">v2</span> <span class="k">SET</span> <span class="n">TBLPROPERTIES</span> <span class="p">(</span><span class="s1">'created.by.user'</span> <span class="o">=</span> <span class="nv">"John"</span><span class="p">,</span> <span class="s1">'created.date'</span> <span class="o">=</span> <span class="s1">'01-01-2001'</span> <span class="p">);</span> |
| |
| <span class="c1">-- Use `DESCRIBE TABLE EXTENDED tempdb1.v2` to verify</span> |
| <span class="k">DESC</span> <span class="k">TABLE</span> <span class="n">EXTENDED</span> <span class="n">tempdb1</span><span class="p">.</span><span class="n">v2</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">c1</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">c2</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="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|#</span> <span class="n">Detailed</span> <span class="k">Table</span> <span class="n">Information</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span><span class="k">Database</span> <span class="o">|</span><span class="n">tempdb1</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span><span class="k">Table</span> <span class="o">|</span><span class="n">v2</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span><span class="k">Table</span> <span class="n">Properties</span> <span class="o">|</span><span class="p">[</span><span class="n">created</span><span class="p">.</span><span class="k">by</span><span class="p">.</span><span class="k">user</span><span class="o">=</span><span class="n">John</span><span class="p">,</span> <span class="n">created</span><span class="p">.</span><span class="nb">date</span><span class="o">=</span><span class="mi">01</span><span class="o">-</span><span class="mi">01</span><span class="o">-</span><span class="mi">2001</span><span class="p">,</span> <span class="p">....]</span><span class="o">|</span> <span class="o">|</span> |
| <span class="o">+</span><span class="c1">----------------------------+-----------------------------------------------------+-------+</span> |
| |
| <span class="c1">-- Remove the key `created.by.user` and `created.date` from `TBLPROPERTIES`</span> |
| <span class="k">ALTER</span> <span class="k">VIEW</span> <span class="n">tempdb1</span><span class="p">.</span><span class="n">v2</span> <span class="n">UNSET</span> <span class="n">TBLPROPERTIES</span> <span class="p">(</span><span class="s1">'created.by.user'</span><span class="p">,</span> <span class="s1">'created.date'</span><span class="p">);</span> |
| |
| <span class="c1">--Use `DESC TABLE EXTENDED tempdb1.v2` to verify the changes</span> |
| <span class="k">DESC</span> <span class="k">TABLE</span> <span class="n">EXTENDED</span> <span class="n">tempdb1</span><span class="p">.</span><span class="n">v2</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">c1</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">c2</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="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|#</span> <span class="n">Detailed</span> <span class="k">Table</span> <span class="n">Information</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span><span class="k">Database</span> <span class="o">|</span><span class="n">tempdb1</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span><span class="k">Table</span> <span class="o">|</span><span class="n">v2</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span><span class="k">Table</span> <span class="n">Properties</span> <span class="o">|</span><span class="p">[....]</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">+</span><span class="c1">----------------------------+----------+-------+</span> |
| |
| <span class="c1">-- Change the view definition</span> |
| <span class="k">ALTER</span> <span class="k">VIEW</span> <span class="n">tempdb1</span><span class="p">.</span><span class="n">v2</span> <span class="k">AS</span> <span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="n">tempdb1</span><span class="p">.</span><span class="n">v1</span><span class="p">;</span> |
| |
| <span class="c1">-- Use `DESC TABLE EXTENDED` to verify</span> |
| <span class="k">DESC</span> <span class="k">TABLE</span> <span class="n">EXTENDED</span> <span class="n">tempdb1</span><span class="p">.</span><span class="n">v2</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">c1</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">c2</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="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|#</span> <span class="n">Detailed</span> <span class="k">Table</span> <span class="n">Information</span><span class="o">|</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span><span class="k">Database</span> <span class="o">|</span><span class="n">tempdb1</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span><span class="k">Table</span> <span class="o">|</span><span class="n">v2</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span><span class="k">Type</span> <span class="o">|</span><span class="k">VIEW</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span><span class="k">View</span> <span class="nb">Text</span> <span class="o">|</span><span class="k">select</span> <span class="o">*</span> <span class="k">from</span> <span class="n">tempdb1</span><span class="p">.</span><span class="n">v1</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">|</span><span class="k">View</span> <span class="n">Original</span> <span class="nb">Text</span> <span class="o">|</span><span class="k">select</span> <span class="o">*</span> <span class="k">from</span> <span class="n">tempdb1</span><span class="p">.</span><span class="n">v1</span> <span class="o">|</span> <span class="o">|</span> |
| <span class="o">+</span><span class="c1">----------------------------+---------------------------+-------+</span></code></pre></figure> |
| |
| <h3 id="related-statements">Related Statements</h3> |
| |
| <ul> |
| <li><a href="sql-ref-syntax-aux-describe-table.html">describe-table</a></li> |
| <li><a href="sql-ref-syntax-ddl-create-view.html">create-view</a></li> |
| <li><a href="sql-ref-syntax-ddl-drop-view.html">drop-view</a></li> |
| </ul> |
| |
| <h4 id="note">Note:</h4> |
| |
| <p><code class="highlighter-rouge">ALTER VIEW</code> statement does not support <code class="highlighter-rouge">SET SERDE</code> or <code class="highlighter-rouge">SET SERDEPROPERTIES</code> properties</p> |
| |
| |
| |
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