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<a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/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 Apache Ignite 3.0 Alpha.</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="listingblock">
<div class="content">
<pre class="rouge highlight"><code data-lang="sql"><span class="k">CREATE</span> <span class="k">TABLE</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">simpleName</span> <span class="o">|</span> <span class="n">schemaName</span><span class="p">.</span><span class="n">simpleName</span><span class="p">]</span> <span class="p">(</span><span class="n">tableColumn</span> <span class="p">[,</span> <span class="n">tableColumn</span><span class="p">]...)</span>
<span class="p">[</span><span class="n">COLOCATE</span> <span class="p">[</span><span class="k">BY</span><span class="p">]</span> <span class="p">(</span><span class="n">tableColumn</span> <span class="p">[,</span> <span class="n">tableColumn</span><span class="p">]...)]</span>
<span class="p">[</span><span class="n">ENGINE</span> <span class="n">engineName</span><span class="p">]</span>
<span class="p">[</span><span class="k">WITH</span> <span class="n">paramName</span><span class="o">=</span><span class="n">paramValue</span> <span class="p">[,</span><span class="n">paramName</span><span class="o">=</span><span class="n">paramValue</span><span class="p">]...]</span>
<span class="n">tableColumn</span> <span class="o">=</span> <span class="n">columnName</span> <span class="n">columnType</span> <span class="p">[[</span><span class="k">NOT</span><span class="p">]</span> <span class="k">NULL</span><span class="p">]</span> <span class="p">[</span><span class="k">DEFAULT</span> <span class="n">defaultValue</span><span class="p">]</span> <span class="p">[</span><span class="k">PRIMARY</span> <span class="k">KEY</span><span class="p">]</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Parameters:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>tableName</code> - name of the table.</p>
</li>
<li>
<p><code>tableColumn</code> - name and type of a column to be created in the new table.</p>
</li>
<li>
<p><code>DEFAULT</code> - specifies a default value for the column. Only constant values are accepted.</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>ENGINE</code> - selects the storage engine to use. Currently <code>pagememory</code> and <code>rocksdb</code> are available.</p>
</li>
<li>
<p><code>COLOCATED 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>WITH</code> - accepts additional parameters not defined by ANSI-99 SQL:</p>
<div class="ulist">
<ul>
<li>
<p><code>Replicas</code> - sets the number of partition copies, including the master copy.</p>
</li>
<li>
<p><code>Partitions</code> - sets the number of table partitions.</p>
</li>
<li>
<p><code>dataRegion</code> - sets the data region to work with.</p>
</li>
</ul>
</div>
</li>
</ul>
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<div class="paragraph">
<p>Examples:</p>
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<div class="paragraph">
<p>Create 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>
<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="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
<h3 id="scope-of-alter-table" class="discrete">Scope of ALTER TABLE</h3>
<div class="paragraph">
<p>Presently, Apache Ignite only supports addition and removal of columns.</p>
</div>
</td>
</tr>
</table>
</div>
<div class="ulist">
<ul>
<li>
<p><strong>ALTER TABLE IF EXISTS table LOGGING</strong></p>
</li>
</ul>
</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="p">[</span><span class="n">IF</span> <span class="k">EXISTS</span><span class="p">]</span> <span class="n">tableName</span> <span class="err">{</span><span class="n">LOGGING</span><span class="err">}</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Parameters:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>IF EXISTS</code> - if applied to <code>TABLE</code>, do not throw an error if a table with the specified table name does not exist. If applied to <code>COLUMN</code>, do not throw an error if a column with the specified name does not exist.</p>
</li>
<li>
<p><code>qualified_table_name</code> - the name of the table.</p>
</li>
<li>
<p><code>LOGGING</code> - enables write-ahead logging for the table. The command is relevant only if Ignite <a href="https://ignite.apache.org/docs/3.0.0-alpha/persistence" target="_blank" rel="noopener">persistence</a> is used.</p>
</li>
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<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="p">[</span><span class="n">IF</span> <span class="k">EXISTS</span><span class="p">]</span> <span class="n">tableName</span> <span class="err">{</span><span class="n">NOLOGGING</span><span class="err">}</span></code></pre>
</div>