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<article data-swiftype-index='true'>
<a class='edit-link' href="https://github.com/apache/ignite-3/tree/main/docs/_docs/sql-reference/ddl.adoc" target="_blank">Edit</a>
<h1>Data Definition Language (DDL)</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>This section walks you through all data definition language (DDL) commands supported by Ignite 3.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="create-table">CREATE TABLE</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Creates a new table.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
This can also be done via the <a href="/docs/ignite3/latest/developers-guide/java-to-tables">Java API</a>.
</td>
</tr>
</table>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Terminal('CREATE'),
Terminal('TABLE'),
Optional(Terminal('IF NOT EXISTS')),
NonTerminal('table_name', {href:'./grammar-reference/#qualified_table_name'}),
Terminal('('),
Choice(1,
NonTerminal('constraint', {href:'./grammar-reference/#constraint'}),
NonTerminal('column_definition', {href:'./grammar-reference/#column_definition'}),
Terminal(',')),
Terminal(')'),
End({type:'complex'})
)</p>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Start({type:'complex'}),
Optional(
Sequence(
Terminal('COLOCATE'),
Optional('BY'),
NonTerminal('column_list', {href:'./grammar-reference/#column_list'})
)
),
Optional(
Sequence(
Terminal('ZONE'),
NonTerminal('zone_name')
)
),
Optional(
Sequence(
Terminal('STORAGE ENGINE'),
NonTerminal('storage_engine_name')
)
)
)</p>
</div>
<div class="paragraph">
<p>Keywords and parameters:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>table_name</code> - name of the table. Can be schema-qualified.</p>
</li>
<li>
<p><code>IF NOT EXISTS</code> - create the table only if a table with the same name does not exist.</p>
</li>
<li>
<p><code>COLOCATE BY</code> - colocation key. The key can be composite. Primary key must include colocation key. Was <code>affinity_key</code> in Ignite 2.x.</p>
</li>
<li>
<p><code>ZONE</code> - sets the <a href="/docs/ignite3/latest/sql-reference/distribution-zones">Distribution Zone</a>.</p>
</li>
<li>
<p><code>STORAGE ENGINE</code> - sets the <a href="/docs/ignite3/latest/sql-reference/distribution-zones">Distribution Zone</a>.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Examples:</p>
</div>
<div class="paragraph">
<p>Creates a Person table:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">IF</span> <span class="k">NOT</span> <span class="k">EXISTS</span> <span class="n">Person</span> <span class="p">(</span>
<span class="n">id</span> <span class="nb">int</span> <span class="k">primary</span> <span class="k">key</span><span class="p">,</span>
<span class="n">city_id</span> <span class="nb">int</span><span class="p">,</span>
<span class="n">name</span> <span class="nb">varchar</span><span class="p">,</span>
<span class="n">age</span> <span class="nb">int</span><span class="p">,</span>
<span class="n">company</span> <span class="nb">varchar</span>
<span class="p">)</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Creates a Person table that uses distribution zone <code>MYZONE</code>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">IF</span> <span class="k">NOT</span> <span class="k">EXISTS</span> <span class="n">Person</span> <span class="p">(</span>
<span class="n">id</span> <span class="nb">int</span> <span class="k">primary</span> <span class="k">key</span><span class="p">,</span>
<span class="n">city_id</span> <span class="nb">int</span><span class="p">,</span>
<span class="n">name</span> <span class="nb">varchar</span><span class="p">,</span>
<span class="n">age</span> <span class="nb">int</span><span class="p">,</span>
<span class="n">company</span> <span class="nb">varchar</span>
<span class="p">)</span> <span class="k">ZONE</span> <span class="n">MYZONE</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Creates a Person table where the default value if the <code>city_id</code> column is 1:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">IF</span> <span class="k">NOT</span> <span class="k">EXISTS</span> <span class="n">Person</span> <span class="p">(</span>
<span class="n">id</span> <span class="nb">int</span> <span class="k">primary</span> <span class="k">key</span><span class="p">,</span>
<span class="n">city_id</span> <span class="nb">int</span> <span class="k">default</span> <span class="mi">1</span><span class="p">,</span>
<span class="n">name</span> <span class="nb">varchar</span><span class="p">,</span>
<span class="n">age</span> <span class="nb">int</span><span class="p">,</span>
<span class="n">company</span> <span class="nb">varchar</span>
<span class="p">)</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Creates a Person table with the <code>duration</code> column automatically set a week into the future:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">CREATE</span> <span class="k">TABLE</span> <span class="n">IF</span> <span class="k">NOT</span> <span class="k">EXISTS</span> <span class="n">Person</span> <span class="p">(</span>
<span class="n">id</span> <span class="nb">int</span> <span class="k">primary</span> <span class="k">key</span><span class="p">,</span>
<span class="n">city_id</span> <span class="nb">int</span><span class="p">,</span>
<span class="n">name</span> <span class="nb">varchar</span><span class="p">,</span>
<span class="n">age</span> <span class="nb">int</span><span class="p">,</span>
<span class="n">company</span> <span class="nb">varchar</span><span class="p">,</span>
<span class="n">duration</span> <span class="nb">timestamp</span> <span class="k">default</span> <span class="k">CURRENT_TIMESTAMP</span> <span class="o">+</span> <span class="n">INTERVAL</span> <span class="s1">'1'</span> <span class="n">WEEK</span>
<span class="p">)</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="alter-table">ALTER TABLE</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Modifies the structure of an existing table.</p>
</div>
<div class="sect2">
<h3 id="alter-table-if-exists-table-add-column-column1-int-column2-int">ALTER TABLE IF EXISTS table ADD COLUMN (column1 int, column2 int)</h3>
<div class="paragraph">
<p>Adds column(s) to an existing table.</p>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Terminal('ALTER TABLE'),
Optional(Terminal('IF EXISTS')),
NonTerminal('qualified_table_name', {href:'./grammar-reference/#qualified_table_name'}),
Terminal('ADD'),
Optional(Terminal('COLUMN')),
End({type:'complex'})
)</p>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Start({type:'complex'}),
NonTerminal('column_definition_or_list', {href:'./grammar-reference/#column_definition_or_list'})
)</p>
</div>
<div class="paragraph">
<p>Keywords and parameters:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>IF EXISTS</code> - do not throw an error if a table with the specified table name does not exist.</p>
</li>
<li>
<p><code>ADD</code> - adds a new column or several columns to a previously created table. Once a column is added, it can be accessed using <a href="/docs/ignite3/latest/sql-reference/dml" target="_blank" rel="noopener">DML commands</a> and indexed with the CREATE INDEX statement.</p>
</li>
<li>
<p><code>COLUMN</code> - name of the defined column.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Examples:</p>
</div>
<div class="paragraph">
<p>Add a column to the table:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">Person</span> <span class="k">ADD</span> <span class="k">COLUMN</span> <span class="n">city</span> <span class="nb">varchar</span><span class="p">;</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Add a column​ only if the table exists:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">IF</span> <span class="k">EXISTS</span> <span class="n">Missing</span> <span class="k">ADD</span> <span class="n">number</span> <span class="nb">bigint</span><span class="p">;</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Add several columns to the table at once:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">Region</span> <span class="k">ADD</span> <span class="k">COLUMN</span> <span class="p">(</span><span class="n">code</span> <span class="nb">varchar</span><span class="p">,</span> <span class="n">gdp</span> <span class="nb">double</span><span class="p">);</span></code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="alter-table-if-exists-table-drop-column-column1-column2-int">ALTER TABLE IF EXISTS table DROP COLUMN (column1, column2 int)</h3>
<div class="paragraph">
<p>Removes column(s) from an existing table.</p>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Terminal('ALTER TABLE'),
Optional(Terminal('IF EXISTS')),
NonTerminal('qualified_table_name', {href:'./grammar-reference/#qualified_table_name'}),
Terminal('DROP'),
Optional(Terminal('COLUMN')),
End({type:'complex'})
)</p>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Start({type:'complex'}),
NonTerminal('column_list', {href:'./grammar-reference/#column_list'})
)</p>
</div>
<div class="paragraph">
<p>Keywords and parameters:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>IF EXISTS</code> - do not throw an error if a table with the specified table name does not exist.</p>
</li>
<li>
<p><code>DROP</code> - removes an existing column or multiple columns from a table. Once a column is removed, it cannot be accessed within queries. Consider the following notes and limitations:</p>
<div class="paragraph">
<p>If the column was indexed, the index has to be dropped manually in advance by using the 'DROP INDEX' command.
It is not possible to remove a column if it represents the whole value stored in the cluster. The limitation is relevant for primitive values.
Ignite stores data in the form of key-value pairs and all the new columns will belong to the value. It&#8217;s not possible to change a set of columns of the key (<code>PRIMARY KEY</code>).</p>
</div>
</li>
<li>
<p><code>COLUMN</code> - name of the defined column.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Schema changes applied by this command are persisted on disk. Thus, the changes can survive full cluster restarts.</p>
</div>
<div class="paragraph">
<p>Examples:</p>
</div>
<div class="paragraph">
<p>Drop a column from the table:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">Person</span> <span class="k">DROP</span> <span class="k">COLUMN</span> <span class="n">city</span><span class="p">;</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Drop a column only if the table exists:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">IF</span> <span class="k">EXISTS</span> <span class="n">Person</span> <span class="k">DROP</span> <span class="k">COLUMN</span> <span class="n">number</span><span class="p">;</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Drop several columns from the table at once:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">Person</span> <span class="k">DROP</span> <span class="k">COLUMN</span> <span class="p">(</span><span class="n">code</span><span class="p">,</span> <span class="n">gdp</span><span class="p">);</span></code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="alter-table-if-exists-table-alter-column-column-set-data-type">ALTER TABLE IF EXISTS table ALTER COLUMN column SET DATA TYPE</h3>
<div class="paragraph">
<p>Modifies column(s) in an existing table.</p>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Terminal('ALTER TABLE'),
Optional(Terminal('IF EXISTS')),
NonTerminal('qualified_table_name', {href:'./grammar-reference/#qualified_table_name'}),
Terminal('ALTER COLUMN'),
NonTerminal('column_name', {href:'./grammar-reference/#column_name'}),
End({type:'complex'})
)</p>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Start({type:'complex'}),
Terminal('SET DATA TYPE'),
NonTerminal('data_type'),
NonTerminal('('),
Optional(
Sequence(
Choice (0,'NOT NULL','NULLABLE')
)
)
)</p>
</div>
<div class="paragraph">
<p>Keywords and parameters:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>IF EXISTS</code> - do not throw an error if a table with the specified table name does not exist.</p>
</li>
<li>
<p><code>ALTER COLUMN</code> - alter the defined column.</p>
</li>
<li>
<p><code>SET DATA TYPE</code> - set data type of the defined column.</p>
</li>
<li>
<p><code>data_type</code> - a valid <a href="/docs/ignite3/latest/sql-reference/data-types">data type</a>. If the data type supports arguments, you can specify them as well.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Examples:</p>
</div>
<div class="paragraph">
<p>Alter a column in the table:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">Person</span> <span class="k">ALTER</span> <span class="k">COLUMN</span> <span class="n">city</span> <span class="nb">varchar</span><span class="p">;</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Alter several columns in the table at once:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">Region</span> <span class="k">ALTER</span> <span class="k">COLUMN</span> <span class="p">(</span><span class="n">code</span> <span class="nb">varchar</span><span class="p">,</span> <span class="n">gdp</span> <span class="nb">double</span><span class="p">);</span></code></pre>
</div>
</div>
<div class="sect3">
<h4 id="supported-transitions">Supported Transitions</h4>
<div class="paragraph">
<p>Not all data type transitions are supported. The limitations are listed below:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>FLOAT</code> can be transitioned to <code>DOUBLE</code></p>
</li>
<li>
<p><code>INT8</code>, <code>INT16</code> and <code>INT64</code> can be transitioned to <code>INT32</code></p>
</li>
<li>
<p><code>TYPE SCALE</code> change is forbidden</p>
</li>
<li>
<p><code>TYPE PRECISION</code> increase is allowed for DECIMAL non PK column</p>
</li>
<li>
<p><code>TYPE LENGTH</code> increase is allowed for STRING and BYTE_ARRAY non PK column</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Other transitions are not supported.</p>
</div>
<div class="paragraph">
<p>Examples:</p>
</div>
<div class="paragraph">
<p>Changes the possible range of IDs to BIGINT ranges:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">cities</span> <span class="k">ALTER</span> <span class="k">COLUMN</span> <span class="n">ID</span> <span class="k">SET</span> <span class="k">DATA</span> <span class="k">TYPE</span> <span class="nb">BIGINT</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Sets the length of a column text to 11:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">cities</span> <span class="k">ALTER</span> <span class="k">COLUMN</span> <span class="n">name</span> <span class="k">SET</span> <span class="k">DATA</span> <span class="k">TYPE</span> <span class="nb">varchar</span><span class="p">(</span><span class="mi">11</span><span class="p">)</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect2">
<h3 id="alter-table-if-exists-table-alter-column-column-set-not-null">ALTER TABLE IF EXISTS table ALTER COLUMN column SET NOT NULL</h3>
<div class="paragraph diagram-container">
<p>Diagram(
Terminal('ALTER TABLE'),
Optional(Terminal('IF EXISTS')),
NonTerminal('qualified_table_name', {href:'./grammar-reference/#qualified_table_name'}),
Terminal('ALTER COLUMN'),
NonTerminal('column_name', {href:'./grammar-reference/#column_name'}),
End({type:'complex'})
)</p>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Start({type:'complex'}),
Terminal('SET NOT NULL'),
End({type:'simple'})
)</p>
</div>
<div class="paragraph">
<p>Keywords and parameters:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>IF EXISTS</code> - do not throw an error if a table with the specified table name does not exist.</p>
</li>
<li>
<p><code>ALTER COLUMN</code> - alter the defined column.</p>
</li>
<li>
<p><code>SET DATA TYPE</code> - set the defined column value to no a not-null value.</p>
</li>
</ul>
</div>
<div class="sect3">
<h4 id="supported-transitions-2">Supported Transitions</h4>
<div class="paragraph">
<p>Not all data type transitions are supported. The limitations are listed below:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>NULLABLE</code> to <code>NOT NULL</code> transition is forbidden</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect2">
<h3 id="alter-table-if-exists-table-alter-column-column-drop-not-null">ALTER TABLE IF EXISTS table ALTER COLUMN column DROP NOT NULL</h3>
<div class="paragraph diagram-container">
<p>Diagram(
Terminal('ALTER TABLE'),
Optional(Terminal('IF EXISTS')),
NonTerminal('qualified_table_name', {href:'./grammar-reference/#qualified_table_name'}),
Terminal('ALTER COLUMN'),
NonTerminal('column_name', {href:'./grammar-reference/#column_name'}),
End({type:'complex'})
)</p>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Start({type:'complex'}),
Terminal('DROP NOT NULL'),
End({type:'simple'})
)</p>
</div>
<div class="paragraph">
<p>Keywords and parameters:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>IF EXISTS</code> - do not throw an error if a table with the specified table name does not exist.</p>
</li>
<li>
<p><code>ALTER COLUMN</code> - alter the defined column.</p>
</li>
<li>
<p><code>DROP NOT NULL</code> - drop all not-null values.</p>
</li>
</ul>
</div>
<div class="sect3">
<h4 id="supported-transitions-3">Supported Transitions</h4>
<div class="paragraph">
<p>Not all data type transitions are supported. The limitations are listed below:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>NOT NULL</code> to <code>NULLABLE</code> transition is allowed for any non-PK column</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect2">
<h3 id="alter-table-if-exists-table-alter-column-column-set-default">ALTER TABLE IF EXISTS table ALTER COLUMN column SET DEFAULT</h3>
<div class="paragraph diagram-container">
<p>Diagram(
Terminal('ALTER TABLE'),
Optional(Terminal('IF EXISTS')),
NonTerminal('qualified_table_name', {href:'./grammar-reference/#qualified_table_name'}),
Terminal('ALTER COLUMN'),
NonTerminal('column_name', {href:'./grammar-reference/#column_name'}),
End({type:'complex'})
)</p>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Start({type:'complex'}),
Terminal('SET DEFAULT'),
NonTerminal('default_value'),
End({type:'simple'})
)</p>
</div>
<div class="paragraph">
<p>Keywords and parameters:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>IF NOT EXISTS</code> - do not throw an error if a table with the specified table name does not exist.</p>
</li>
<li>
<p><code>ALTER COLUMN</code> - alter the defined column.</p>
</li>
<li>
<p><code>SET DEFAULT</code> - set the defined column&#8217;s default value to the provided one.</p>
</li>
<li>
<p><code>default_value</code> - new default value for the column.</p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="alter-table-if-exists-table-alter-column-column-drop-default">ALTER TABLE IF EXISTS table ALTER COLUMN column DROP DEFAULT</h3>
<div class="paragraph diagram-container">
<p>Diagram(
Terminal('ALTER TABLE'),
Optional(Terminal('IF EXISTS')),
NonTerminal('qualified_table_name', {href:'./grammar-reference/#qualified_table_name'}),
Terminal('ALTER COLUMN'),
NonTerminal('column_name', {href:'./grammar-reference/#column_name'}),
End({type:'complex'})
)</p>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Start({type:'complex'}),
Terminal('DROP DEFAULT'),
End({type:'simple'})
)</p>
</div>
<div class="paragraph">
<p>Keywords and parameters:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>IF EXISTS</code> - do not throw an error if a table with the specified table name does not exist.</p>
</li>
<li>
<p><code>ALTER COLUMN</code> - alter the defined column.</p>
</li>
<li>
<p><code>DROP DEFAULT</code> - dropt the default value for the defined column.</p>
</li>
</ul>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="drop-table">DROP TABLE</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The <code>DROP TABLE</code> command drops an existing table.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
This can also be done via the <a href="/docs/ignite3/latest/developers-guide/java-to-tables">Java API</a>.
</td>
</tr>
</table>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Terminal('DROP TABLE'),
Optional(Terminal('IF EXISTS')),
NonTerminal('qualified_table_name', {href:'./grammar-reference/#qualified_table_name'})
)</p>
</div>
<div class="paragraph">
<p>Keywords and parameters:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>IF EXISTS</code> - do not throw an error if a table with the same name does not exist.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Schema changes applied by this command are persisted on disk. Thus, the changes can survive full cluster restarts.</p>
</div>
<div class="paragraph">
<p>Examples:</p>
</div>
<div class="paragraph">
<p>Drop Person table if the one exists:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">DROP</span> <span class="k">TABLE</span> <span class="n">IF</span> <span class="k">EXISTS</span> <span class="nv">"Person"</span><span class="p">;</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="create-index">CREATE INDEX</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Creates a new index.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
This can also be done via the <a href="/docs/ignite3/latest/developers-guide/java-to-tables">Java API</a>.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>When you create a new index, it will start building only after all transactions started before the index creation had been completed. Index build will not start if there are any “hung“ transactions in the logical topology of the cluster.</p>
</div>
<div class="paragraph">
<p>The index status, with the status reason description (e.g., PENDING - “Waiting for transaction ABC to complete”) is reflected in the system view.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
The index cannot include the same column more than once.
</td>
</tr>
</table>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Terminal('CREATE INDEX'),
Optional(Terminal('IF NOT EXISTS')),
NonTerminal('name'),
Terminal('ON'),
NonTerminal('qualified_table_name', {href:'./grammar-reference/#qualified_table_name'}),
End({type:'complex'})
)</p>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Start({type:'complex'}),
Sequence(
Choice (0,
Sequence(
Terminal('USING'),
Choice (0,
Sequence('TREE',NonTerminal ('sorted_column_list', {href:'./grammar-reference/#sorted_column_list'})),
Sequence('HASH',NonTerminal ('column_list', {href:'./grammar-reference/#column_list'}))
),
),
NonTerminal ('sorted_column_list', {href:'./grammar-reference/#sorted_column_list'})
)),
End({type:'simple'})
)</p>
</div>
<div class="paragraph">
<p>Keywords and parameters:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>IF NOT EXISTS</code> - create the index only if an index with the same name does not exist.</p>
</li>
<li>
<p><code>name</code> - name of the index.</p>
</li>
<li>
<p><code>ON</code> - create index on the defined table.</p>
</li>
<li>
<p><code>USING TREE</code> -if specified, creates a tree index.</p>
</li>
<li>
<p><code>USING HASH</code> - if specified, creates a hash index.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Examples:</p>
</div>
<div class="paragraph">
<p>Create an index <code>department_name_idx</code> for the Person table:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">CREATE</span> <span class="k">INDEX</span> <span class="n">IF</span> <span class="k">NOT</span> <span class="k">EXISTS</span> <span class="n">department_name_idx</span> <span class="k">ON</span> <span class="n">Person</span> <span class="p">(</span><span class="n">department_id</span> <span class="k">DESC</span><span class="p">,</span> <span class="n">name</span> <span class="k">ASC</span><span class="p">);</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Create a hash index <code>department_name_idx</code> for the Person table:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">CREATE</span> <span class="k">INDEX</span> <span class="n">name_surname_idx</span> <span class="k">ON</span> <span class="n">Person</span> <span class="k">USING</span> <span class="n">HASH</span> <span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">surname</span><span class="p">);</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Create a tree index <code>department_city_idx</code> for the Person table:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">CREATE</span> <span class="k">INDEX</span> <span class="n">department_city_idx</span> <span class="k">ON</span> <span class="n">Person</span> <span class="k">USING</span> <span class="n">TREE</span> <span class="p">(</span><span class="n">department_id</span> <span class="k">ASC</span><span class="p">,</span> <span class="n">city_id</span> <span class="k">DESC</span><span class="p">);</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="drop-index">DROP INDEX</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Drops an index.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
This can also be done via the <a href="/docs/ignite3/latest/developers-guide/java-to-tables">Java API</a>.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>When you drop an index, it stays in the STOPPING status until all transactions started before the DROP INDEX command had been completed (even those that do not affect any of the tables for which the index is being dropped).
Upon completion of all transactions described above, the space the dropped index had occupied is freed up only when LWM of the relevant partition becomes greater than the time when the index dropping had been activated.
The index status, with the status reason description (e.g., PENDING - “Waiting for transaction ABC to complete”) is reflected in the system view.</p>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Terminal('DROP INDEX'),
Optional(Terminal('IF EXISTS')),
NonTerminal('index_name')
)</p>
</div>
<div class="paragraph">
<p>Keywords and parameters:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>index_name</code> - the name of the index.</p>
</li>
<li>
<p><code>IF EXISTS</code> - do not throw an error if an index with the specified name does not exist.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Examples:</p>
</div>
<div class="paragraph">
<p>Drop index if the one exists:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">DROP</span> <span class="k">INDEX</span> <span class="n">IF</span> <span class="k">EXISTS</span> <span class="n">Persons</span><span class="p">;</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="create-cache">CREATE CACHE</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Creates a new <a href="/docs/ignite3/latest/ddl.adoc/developers-guide/cache">cache</a>.</p>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Terminal('CREATE'),
Terminal('CACHE'),
Optional(Terminal('IF NOT EXISTS')),
NonTerminal('table_name', {href:'./grammar-reference/#qualified_table_name'}),
Terminal('('),
Choice(1,
NonTerminal('constraint', {href:'./grammar-reference/#constraint'}),
NonTerminal('column_definition', {href:'./grammar-reference/#column_definition'}),
Terminal(',')),
Terminal(')'),
End({type:'complex'})
)</p>
</div>
<div class="paragraph diagram-container">
<p>Diagram(
Start({type:'complex'}),
Optional(
Sequence(
Terminal('COLOCATE'),
Optional('BY'),
NonTerminal('column_list', {href:'./grammar-reference/#column_list'})
)
),
Optional(
Sequence(
Terminal('ZONE'),
NonTerminal('zone_name')
)
),
Optional(
Sequence(
Terminal('STORAGE ENGINE'),
NonTerminal('storage_engine_name')
)
)
)</p>
</div>
<div class="paragraph">
<p>Keywords and parameters:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>cache_name</code> - name of the cache. Can be schema-qualified.</p>
</li>
<li>
<p><code>IF NOT EXISTS</code> - create the cache only if a cache with the same name does not exist.</p>
</li>
<li>
<p><code>COLOCATE BY</code> - colocation key. The key can be composite. Primary key must include colocation key. Was <code>affinity_key</code> in Ignite 2.x.</p>
</li>
<li>
<p><code>ZONE</code> - sets the <a href="/docs/ignite3/latest/sql-reference/distribution-zones">Distribution Zone</a>. The selected distribution zone must use <code>aimem</code> storage engine.</p>
</li>
<li>
<p><code>STORAGE ENGINE</code> - sets the <a href="/docs/ignite3/latest/sql-reference/distribution-zones">Distribution Zone</a>.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="copyright">
© 2025 The Apache Software Foundation.<br/>
Apache, Apache Ignite, the Apache feather and the Apache Ignite logo are either registered trademarks or trademarks of The Apache Software Foundation.
</div>
</article>
<nav class="right-nav" data-swiftype-index='false'>
<div class="toc-wrapper">
<ul class="sectlevel1">
<li><a href="#create-table">CREATE TABLE</a></li>
<li><a href="#alter-table">ALTER TABLE</a>
<ul class="sectlevel2">
<li><a href="#alter-table-if-exists-table-add-column-column1-int-column2-int">ALTER TABLE IF EXISTS table ADD COLUMN (column1 int, column2 int)</a></li>
<li><a href="#alter-table-if-exists-table-drop-column-column1-column2-int">ALTER TABLE IF EXISTS table DROP COLUMN (column1, column2 int)</a></li>
<li><a href="#alter-table-if-exists-table-alter-column-column-set-data-type">ALTER TABLE IF EXISTS table ALTER COLUMN column SET DATA TYPE</a>
<ul class="sectlevel3">
<li><a href="#supported-transitions">Supported Transitions</a></li>
</ul>
</li>
<li><a href="#alter-table-if-exists-table-alter-column-column-set-not-null">ALTER TABLE IF EXISTS table ALTER COLUMN column SET NOT NULL</a>
<ul class="sectlevel3">
<li><a href="#supported-transitions-2">Supported Transitions</a></li>
</ul>
</li>
<li><a href="#alter-table-if-exists-table-alter-column-column-drop-not-null">ALTER TABLE IF EXISTS table ALTER COLUMN column DROP NOT NULL</a>
<ul class="sectlevel3">
<li><a href="#supported-transitions-3">Supported Transitions</a></li>
</ul>
</li>
<li><a href="#alter-table-if-exists-table-alter-column-column-set-default">ALTER TABLE IF EXISTS table ALTER COLUMN column SET DEFAULT</a></li>
<li><a href="#alter-table-if-exists-table-alter-column-column-drop-default">ALTER TABLE IF EXISTS table ALTER COLUMN column DROP DEFAULT</a></li>
</ul>
</li>
<li><a href="#drop-table">DROP TABLE</a></li>
<li><a href="#create-index">CREATE INDEX</a></li>
<li><a href="#drop-index">DROP INDEX</a></li>
<li><a href="#create-cache">CREATE CACHE</a></li>
</ul>
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