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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>ALTER VIEW</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="sql-alterusermapping.html" title="ALTER USER MAPPING" /><link rel="next" href="sql-analyze.html" title="ANALYZE" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">ALTER VIEW</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="sql-alterusermapping.html" title="ALTER USER MAPPING">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><th width="60%" align="center">SQL Commands</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 11.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="sql-analyze.html" title="ANALYZE">Next</a></td></tr></table><hr></hr></div><div class="refentry" id="SQL-ALTERVIEW"><div class="titlepage"></div><a id="id-1.9.3.45.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">ALTER VIEW</span></h2><p>ALTER VIEW — change the definition of a view</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
ALTER VIEW [ IF EXISTS ] <em class="replaceable"><code>name</code></em> ALTER [ COLUMN ] <em class="replaceable"><code>column_name</code></em> SET DEFAULT <em class="replaceable"><code>expression</code></em>
ALTER VIEW [ IF EXISTS ] <em class="replaceable"><code>name</code></em> ALTER [ COLUMN ] <em class="replaceable"><code>column_name</code></em> DROP DEFAULT
ALTER VIEW [ IF EXISTS ] <em class="replaceable"><code>name</code></em> OWNER TO { <em class="replaceable"><code>new_owner</code></em> | CURRENT_USER | SESSION_USER }
ALTER VIEW [ IF EXISTS ] <em class="replaceable"><code>name</code></em> RENAME TO <em class="replaceable"><code>new_name</code></em>
ALTER VIEW [ IF EXISTS ] <em class="replaceable"><code>name</code></em> SET SCHEMA <em class="replaceable"><code>new_schema</code></em>
ALTER VIEW [ IF EXISTS ] <em class="replaceable"><code>name</code></em> SET ( <em class="replaceable"><code>view_option_name</code></em> [= <em class="replaceable"><code>view_option_value</code></em>] [, ... ] )
ALTER VIEW [ IF EXISTS ] <em class="replaceable"><code>name</code></em> RESET ( <em class="replaceable"><code>view_option_name</code></em> [, ... ] )
</pre></div><div class="refsect1" id="id-1.9.3.45.5"><h2>Description</h2><p>
<code class="command">ALTER VIEW</code> changes various auxiliary properties
of a view. (If you want to modify the view's defining query,
use <code class="command">CREATE OR REPLACE VIEW</code>.)
</p><p>
You must own the view to use <code class="command">ALTER VIEW</code>.
To change a view's schema, you must also have <code class="literal">CREATE</code>
privilege on the new schema.
To alter the owner, you must also be a direct or indirect member of the new
owning role, and that role must have <code class="literal">CREATE</code> privilege on
the view's schema. (These restrictions enforce that altering the owner
doesn't do anything you couldn't do by dropping and recreating the view.
However, a superuser can alter ownership of any view anyway.)
</p></div><div class="refsect1" id="id-1.9.3.45.6"><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="replaceable"><code>name</code></em></span></dt><dd><p>
The name (optionally schema-qualified) of an existing view.
</p></dd><dt><span class="term"><code class="literal">IF EXISTS</code></span></dt><dd><p>
Do not throw an error if the view does not exist. A notice is issued
in this case.
</p></dd><dt><span class="term"><code class="literal">SET</code>/<code class="literal">DROP DEFAULT</code></span></dt><dd><p>
These forms set or remove the default value for a column.
A view column's default value is substituted into any
<code class="command">INSERT</code> or <code class="command">UPDATE</code> command whose target is the
view, before applying any rules or triggers for the view. The view's
default will therefore take precedence over any default values from
underlying relations.
</p></dd><dt><span class="term"><em class="replaceable"><code>new_owner</code></em></span></dt><dd><p>
The user name of the new owner of the view.
</p></dd><dt><span class="term"><em class="replaceable"><code>new_name</code></em></span></dt><dd><p>
The new name for the view.
</p></dd><dt><span class="term"><em class="replaceable"><code>new_schema</code></em></span></dt><dd><p>
The new schema for the view.
</p></dd><dt><span class="term"><code class="literal">SET ( <em class="replaceable"><code>view_option_name</code></em> [= <em class="replaceable"><code>view_option_value</code></em>] [, ... ] )</code><br /></span><span class="term"><code class="literal">RESET ( <em class="replaceable"><code>view_option_name</code></em> [, ... ] )</code></span></dt><dd><p>
Sets or resets a view option. Currently supported options are:
</p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">check_option</code> (<code class="type">string</code>)</span></dt><dd><p>
Changes the check option of the view. The value must
be <code class="literal">local</code> or <code class="literal">cascaded</code>.
</p></dd><dt><span class="term"><code class="literal">security_barrier</code> (<code class="type">boolean</code>)</span></dt><dd><p>
Changes the security-barrier property of the view. The value must
be Boolean value, such as <code class="literal">true</code>
or <code class="literal">false</code>.
</p></dd></dl></div><p>
</p></dd></dl></div></div><div class="refsect1" id="id-1.9.3.45.7"><h2>Notes</h2><p>
For historical reasons, <code class="command">ALTER TABLE</code> can be used with
views too; but the only variants of <code class="command">ALTER TABLE</code>
that are allowed with views are equivalent to the ones shown above.
</p></div><div class="refsect1" id="id-1.9.3.45.8"><h2>Examples</h2><p>
To rename the view <code class="literal">foo</code> to
<code class="literal">bar</code>:
</p><pre class="programlisting">
ALTER VIEW foo RENAME TO bar;
</pre><p>
</p><p>
To attach a default column value to an updatable view:
</p><pre class="programlisting">
CREATE TABLE base_table (id int, ts timestamptz);
CREATE VIEW a_view AS SELECT * FROM base_table;
ALTER VIEW a_view ALTER COLUMN ts SET DEFAULT now();
INSERT INTO base_table(id) VALUES(1); -- ts will receive a NULL
INSERT INTO a_view(id) VALUES(2); -- ts will receive the current time
</pre></div><div class="refsect1" id="id-1.9.3.45.9"><h2>Compatibility</h2><p>
<code class="command">ALTER VIEW</code> is a <span class="productname">PostgreSQL</span>
extension of the SQL standard.
</p></div><div class="refsect1" id="id-1.9.3.45.10"><h2>See Also</h2><span class="simplelist"><a class="xref" href="sql-createview.html" title="CREATE VIEW"><span class="refentrytitle">CREATE VIEW</span></a>, <a class="xref" href="sql-dropview.html" title="DROP VIEW"><span class="refentrytitle">DROP VIEW</span></a></span></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sql-alterusermapping.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sql-commands.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sql-analyze.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">ALTER USER MAPPING </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> ANALYZE</td></tr></table></div></body></html>
