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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>CALL</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-begin.html" title="BEGIN" /><link rel="next" href="sql-checkpoint.html" title="CHECKPOINT" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">CALL</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="sql-begin.html" title="BEGIN">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 15.7 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="sql-checkpoint.html" title="CHECKPOINT">Next</a></td></tr></table><hr /></div><div class="refentry" id="SQL-CALL"><div class="titlepage"></div><a id="id-1.9.3.48.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">CALL</span></h2><p>CALL — invoke a procedure</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
CALL <em class="replaceable"><code>name</code></em> ( [ <em class="replaceable"><code>argument</code></em> ] [, ...] )
</pre></div><div class="refsect1" id="id-1.9.3.48.5"><h2>Description</h2><p>
<code class="command">CALL</code> executes a procedure.
</p><p>
If the procedure has any output parameters, then a result row will be
returned, containing the values of those parameters.
</p></div><div class="refsect1" id="id-1.9.3.48.6"><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 the procedure.
</p></dd><dt><span class="term"><em class="replaceable"><code>argument</code></em></span></dt><dd><p>
An argument expression for the procedure call.
</p><p>
Arguments can include parameter names, using the syntax
<code class="literal"><em class="replaceable"><code>name</code></em> => <em class="replaceable"><code>value</code></em></code>.
This works the same as in ordinary function calls; see
<a class="xref" href="sql-syntax-calling-funcs.html" title="4.3. Calling Functions">Section 4.3</a> for details.
</p><p>
Arguments must be supplied for all procedure parameters that lack
defaults, including <code class="literal">OUT</code> parameters. However,
arguments matching <code class="literal">OUT</code> parameters are not evaluated,
so it's customary to just write <code class="literal">NULL</code> for them.
(Writing something else for an <code class="literal">OUT</code> parameter
might cause compatibility problems with
future <span class="productname">PostgreSQL</span> versions.)
</p></dd></dl></div></div><div class="refsect1" id="id-1.9.3.48.7"><h2>Notes</h2><p>
The user must have <code class="literal">EXECUTE</code> privilege on the procedure in
order to be allowed to invoke it.
</p><p>
To call a function (not a procedure), use <code class="command">SELECT</code> instead.
</p><p>
If <code class="command">CALL</code> is executed in a transaction block, then the
called procedure cannot execute transaction control statements.
Transaction control statements are only allowed if <code class="command">CALL</code>
is executed in its own transaction.
</p><p>
<span class="application">PL/pgSQL</span> handles output parameters
in <code class="command">CALL</code> commands differently;
see <a class="xref" href="plpgsql-control-structures.html#PLPGSQL-STATEMENTS-CALLING-PROCEDURE" title="43.6.3. Calling a Procedure">Section 43.6.3</a>.
</p></div><div class="refsect1" id="id-1.9.3.48.8"><h2>Examples</h2><pre class="programlisting">
CALL do_db_maintenance();
</pre></div><div class="refsect1" id="id-1.9.3.48.9"><h2>Compatibility</h2><p>
<code class="command">CALL</code> conforms to the SQL standard,
except for the handling of output parameters. The standard
says that users should write variables to receive the values
of output parameters.
</p></div><div class="refsect1" id="id-1.9.3.48.10"><h2>See Also</h2><span class="simplelist"><a class="xref" href="sql-createprocedure.html" title="CREATE PROCEDURE"><span class="refentrytitle">CREATE PROCEDURE</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-begin.html" title="BEGIN">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-checkpoint.html" title="CHECKPOINT">Next</a></td></tr><tr><td width="40%" align="left" valign="top">BEGIN </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.7 Documentation">Home</a></td><td width="40%" align="right" valign="top"> CHECKPOINT</td></tr></table></div></body></html>
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