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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>DROP PROCEDURE</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-droppolicy.html" title="DROP POLICY" /><link rel="next" href="sql-droppublication.html" title="DROP PUBLICATION" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">DROP PROCEDURE</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="sql-droppolicy.html" title="DROP POLICY">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 15.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="sql-droppublication.html" title="DROP PUBLICATION">Next</a></td></tr></table><hr /></div><div class="refentry" id="SQL-DROPPROCEDURE"><div class="titlepage"></div><a id="id-1.9.3.124.1" class="indexterm"></a><div class="refnamediv"><h2><span class="refentrytitle">DROP PROCEDURE</span></h2><p>DROP PROCEDURE — remove a procedure</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">
DROP PROCEDURE [ IF EXISTS ] <em class="replaceable"><code>name</code></em> [ ( [ [ <em class="replaceable"><code>argmode</code></em> ] [ <em class="replaceable"><code>argname</code></em> ] <em class="replaceable"><code>argtype</code></em> [, ...] ] ) ] [, ...]
[ CASCADE | RESTRICT ]
</pre></div><div class="refsect1" id="id-1.9.3.124.5"><h2>Description</h2><p>
<code class="command">DROP PROCEDURE</code> removes the definition of one or more
existing procedures. To execute this command the user must be the
owner of the procedure(s). The argument types to the
procedure(s) usually must be specified, since several different procedures
can exist with the same name and different argument lists.
</p></div><div class="refsect1" id="id-1.9.3.124.6"><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="literal">IF EXISTS</code></span></dt><dd><p>
Do not throw an error if the procedure does not exist. A notice is issued
in this case.
</p></dd><dt><span class="term"><em class="replaceable"><code>name</code></em></span></dt><dd><p>
The name (optionally schema-qualified) of an existing procedure.
</p></dd><dt><span class="term"><em class="replaceable"><code>argmode</code></em></span></dt><dd><p>
The mode of an argument: <code class="literal">IN</code>, <code class="literal">OUT</code>,
<code class="literal">INOUT</code>, or <code class="literal">VARIADIC</code>. If omitted,
the default is <code class="literal">IN</code> (but see below).
</p></dd><dt><span class="term"><em class="replaceable"><code>argname</code></em></span></dt><dd><p>
The name of an argument.
Note that <code class="command">DROP PROCEDURE</code> does not actually pay
any attention to argument names, since only the argument data
types are used to determine the procedure's identity.
</p></dd><dt><span class="term"><em class="replaceable"><code>argtype</code></em></span></dt><dd><p>
The data type(s) of the procedure's arguments (optionally
schema-qualified), if any.
See below for details.
</p></dd><dt><span class="term"><code class="literal">CASCADE</code></span></dt><dd><p>
Automatically drop objects that depend on the procedure,
and in turn all objects that depend on those objects
(see <a class="xref" href="ddl-depend.html" title="5.14. Dependency Tracking">Section 5.14</a>).
</p></dd><dt><span class="term"><code class="literal">RESTRICT</code></span></dt><dd><p>
Refuse to drop the procedure if any objects depend on it. This
is the default.
</p></dd></dl></div></div><div class="refsect1" id="SQL-DROPPROCEDURE-NOTES"><h2>Notes</h2><p>
If there is only one procedure of the given name, the argument list
can be omitted. Omit the parentheses too in this case.
</p><p>
In <span class="productname">PostgreSQL</span>, it's sufficient to list the
input (including <code class="literal">INOUT</code>) arguments,
because no two routines of the same name are allowed to share the same
input-argument list. Moreover, the <code class="command">DROP</code> command
will not actually check that you wrote the types
of <code class="literal">OUT</code> arguments correctly; so any arguments that
are explicitly marked <code class="literal">OUT</code> are just noise. But
writing them is recommendable for consistency with the
corresponding <code class="command">CREATE</code> command.
</p><p>
For compatibility with the SQL standard, it is also allowed to write
all the argument data types (including those of <code class="literal">OUT</code>
arguments) without
any <em class="replaceable"><code>argmode</code></em> markers.
When this is done, the types of the procedure's <code class="literal">OUT</code>
argument(s) <span class="emphasis"><em>will</em></span> be verified against the command.
This provision creates an ambiguity, in that when the argument list
contains no <em class="replaceable"><code>argmode</code></em>
markers, it's unclear which rule is intended.
The <code class="command">DROP</code> command will attempt the lookup both ways,
and will throw an error if two different procedures are found.
To avoid the risk of such ambiguity, it's recommendable to
write <code class="literal">IN</code> markers explicitly rather than letting them
be defaulted, thus forcing the
traditional <span class="productname">PostgreSQL</span> interpretation to be
used.
</p><p>
The lookup rules just explained are also used by other commands that
act on existing procedures, such as <code class="command">ALTER PROCEDURE</code>
and <code class="command">COMMENT ON PROCEDURE</code>.
</p></div><div class="refsect1" id="SQL-DROPPROCEDURE-EXAMPLES"><h2>Examples</h2><p>
If there is only one procedure <code class="literal">do_db_maintenance</code>,
this command is sufficient to drop it:
</p><pre class="programlisting">
DROP PROCEDURE do_db_maintenance;
</pre><p>
</p><p>
Given this procedure definition:
</p><pre class="programlisting">
CREATE PROCEDURE do_db_maintenance(IN target_schema text, OUT results text) ...
</pre><p>
any one of these commands would work to drop it:
</p><pre class="programlisting">
DROP PROCEDURE do_db_maintenance(IN target_schema text, OUT results text);
DROP PROCEDURE do_db_maintenance(IN text, OUT text);
DROP PROCEDURE do_db_maintenance(IN text);
DROP PROCEDURE do_db_maintenance(text);
DROP PROCEDURE do_db_maintenance(text, text); -- potentially ambiguous
</pre><p>
However, the last example would be ambiguous if there is also, say,
</p><pre class="programlisting">
CREATE PROCEDURE do_db_maintenance(IN target_schema text, IN options text) ...
</pre></div><div class="refsect1" id="SQL-DROPPROCEDURE-COMPATIBILITY"><h2>Compatibility</h2><p>
This command conforms to the SQL standard, with
these <span class="productname">PostgreSQL</span> extensions:
</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>The standard only allows one procedure to be dropped per command.</p></li><li class="listitem"><p>The <code class="literal">IF EXISTS</code> option is an extension.</p></li><li class="listitem"><p>The ability to specify argument modes and names is an
extension, and the lookup rules differ when modes are given.</p></li></ul></div></div><div class="refsect1" id="id-1.9.3.124.10"><h2>See Also</h2><span class="simplelist"><a class="xref" href="sql-createprocedure.html" title="CREATE PROCEDURE"><span class="refentrytitle">CREATE PROCEDURE</span></a>, <a class="xref" href="sql-alterprocedure.html" title="ALTER PROCEDURE"><span class="refentrytitle">ALTER PROCEDURE</span></a>, <a class="xref" href="sql-dropfunction.html" title="DROP FUNCTION"><span class="refentrytitle">DROP FUNCTION</span></a>, <a class="xref" href="sql-droproutine.html" title="DROP ROUTINE"><span class="refentrytitle">DROP ROUTINE</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-droppolicy.html" title="DROP POLICY">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-droppublication.html" title="DROP PUBLICATION">Next</a></td></tr><tr><td width="40%" align="left" valign="top">DROP POLICY </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> DROP PUBLICATION</td></tr></table></div></body></html>
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