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alter-table.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>8.2. ALTER TABLE — Presto 0.202 Documentation</title>
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<body role="document">
<div class="header">
<h1 class="heading"><a href="../index.html">
<span>Presto 0.202 Documentation</span></a></h1>
<h2 class="heading"><span>8.2. ALTER TABLE</span></h2>
</div>
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<p class="nav">
<span class="left">
« <a href="alter-schema.html">8.1. ALTER SCHEMA</a>
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<div class="content">
<div class="section" id="alter-table">
<h1>8.2. ALTER TABLE</h1>
<div class="section" id="synopsis">
<h2>Synopsis</h2>
<div class="highlight-none"><div class="highlight"><pre><span></span>ALTER TABLE name RENAME TO new_name
ALTER TABLE name ADD COLUMN column_name data_type [ COMMENT comment ]
ALTER TABLE name DROP COLUMN column_name
ALTER TABLE name RENAME COLUMN column_name TO new_column_name
</pre></div>
</div>
</div>
<div class="section" id="description">
<h2>Description</h2>
<p>Change the definition of an existing table.</p>
</div>
<div class="section" id="examples">
<h2>Examples</h2>
<p>Rename table <code class="docutils literal"><span class="pre">users</span></code> to <code class="docutils literal"><span class="pre">people</span></code>:</p>
<div class="highlight-sql"><div class="highlight"><pre><span></span><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">users</span> <span class="k">RENAME</span> <span class="k">TO</span> <span class="n">people</span><span class="p">;</span>
</pre></div>
</div>
<p>Add column <code class="docutils literal"><span class="pre">zip</span></code> to the <code class="docutils literal"><span class="pre">users</span></code> table:</p>
<div class="highlight-sql"><div class="highlight"><pre><span></span><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">users</span> <span class="k">ADD</span> <span class="k">COLUMN</span> <span class="n">zip</span> <span class="nb">varchar</span><span class="p">;</span>
</pre></div>
</div>
<p>Drop column <code class="docutils literal"><span class="pre">zip</span></code> from the <code class="docutils literal"><span class="pre">users</span></code> table:</p>
<div class="highlight-sql"><div class="highlight"><pre><span></span><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">users</span> <span class="k">DROP</span> <span class="k">COLUMN</span> <span class="n">zip</span><span class="p">;</span>
</pre></div>
</div>
<p>Rename column <code class="docutils literal"><span class="pre">id</span></code> to <code class="docutils literal"><span class="pre">user_id</span></code> in the <code class="docutils literal"><span class="pre">users</span></code> table:</p>
<div class="highlight-sql"><div class="highlight"><pre><span></span><span class="k">ALTER</span> <span class="k">TABLE</span> <span class="n">users</span> <span class="k">RENAME</span> <span class="k">COLUMN</span> <span class="n">id</span> <span class="k">TO</span> <span class="n">user_id</span><span class="p">;</span>
</pre></div>
</div>
</div>
<div class="section" id="see-also">
<h2>See Also</h2>
<p><a class="reference internal" href="create-table.html"><span class="doc">CREATE TABLE</span></a></p>
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