diff options
Diffstat (limited to 'doc/src/sgml/html/sql-alterview.html')
| -rw-r--r-- | doc/src/sgml/html/sql-alterview.html | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/doc/src/sgml/html/sql-alterview.html b/doc/src/sgml/html/sql-alterview.html new file mode 100644 index 0000000..0a929f8 --- /dev/null +++ b/doc/src/sgml/html/sql-alterview.html @@ -0,0 +1,76 @@ +<?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 |