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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:19:15 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:19:15 +0000
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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!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 V1.79.1" /><link rel="prev" href="sql-alterusermapping.html" title="ALTER USER MAPPING" /><link rel="next" href="sql-analyze.html" title="ANALYZE" /></head><body id="docContent" class="container-fluid col-10"><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 13.4 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 [ COLUMN ] <em class="replaceable"><code>column_name</code></em> TO <em class="replaceable"><code>new_column_name</code></em>
+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"><em class="replaceable"><code>column_name</code></em></span></dt><dd><p>
+ Name of an existing column.
+ </p></dd><dt><span class="term"><em class="replaceable"><code>new_column_name</code></em></span></dt><dd><p>
+ New name for an existing column.
+ </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">enum</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></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 xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navfooter"><hr></hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sql-alterusermapping.html" title="ALTER USER MAPPING">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sql-commands.html" title="SQL Commands">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sql-analyze.html" title="ANALYZE">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" title="PostgreSQL 13.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> ANALYZE</td></tr></table></div></body></html> \ No newline at end of file
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