<!--
doc/src/sgml/ref/drop_procedure.sgml
PostgreSQL documentation
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<refentry id="sql-dropprocedure">
 <indexterm zone="sql-dropprocedure">
  <primary>DROP PROCEDURE</primary>
 </indexterm>

 <refmeta>
  <refentrytitle>DROP PROCEDURE</refentrytitle>
  <manvolnum>7</manvolnum>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname>DROP PROCEDURE</refname>
  <refpurpose>remove a procedure</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
<synopsis>
DROP PROCEDURE [ IF EXISTS ] <replaceable class="parameter">name</replaceable> [ ( [ [ <replaceable class="parameter">argmode</replaceable> ] [ <replaceable class="parameter">argname</replaceable> ] <replaceable class="parameter">argtype</replaceable> [, ...] ] ) ] [, ...]
    [ CASCADE | RESTRICT ]
</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

  <para>
   <command>DROP PROCEDURE</command> removes the definition of an existing
   procedure. To execute this command the user must be the
   owner of the procedure. The argument types to the
   procedure must be specified, since several different procedures
   can exist with the same name and different argument lists.
  </para>
 </refsect1>

 <refsect1>
  <title>Parameters</title>

  <variablelist>
    <varlistentry>
    <term><literal>IF EXISTS</literal></term>
    <listitem>
     <para>
      Do not throw an error if the procedure does not exist. A notice is issued
      in this case.
     </para>
    </listitem>
   </varlistentry>

  <varlistentry>
    <term><replaceable class="parameter">name</replaceable></term>
    <listitem>
     <para>
      The name (optionally schema-qualified) of an existing procedure.  If no
      argument list is specified, the name must be unique in its schema.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">argmode</replaceable></term>

    <listitem>
     <para>
      The mode of an argument: <literal>IN</literal>, <literal>OUT</literal>,
      <literal>INOUT</literal>, or <literal>VARIADIC</literal>.  If omitted,
      the default is <literal>IN</literal>.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">argname</replaceable></term>

    <listitem>
     <para>
      The name of an argument.
      Note that <command>DROP PROCEDURE</command> does not actually pay
      any attention to argument names, since only the argument data
      types are needed to determine the procedure's identity.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">argtype</replaceable></term>

    <listitem>
     <para>
      The data type(s) of the procedure's arguments (optionally
      schema-qualified), if any.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>CASCADE</literal></term>
    <listitem>
     <para>
      Automatically drop objects that depend on the procedure,
      and in turn all objects that depend on those objects
      (see <xref linkend="ddl-depend"/>).
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>RESTRICT</literal></term>
    <listitem>
     <para>
      Refuse to drop the procedure if any objects depend on it.  This
      is the default.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1 id="sql-dropprocedure-examples">
  <title>Examples</title>

<programlisting>
DROP PROCEDURE do_db_maintenance();
</programlisting>
 </refsect1>

 <refsect1 id="sql-dropprocedure-compatibility">
  <title>Compatibility</title>

  <para>
   This command conforms to the SQL standard, with
   these <productname>PostgreSQL</productname> extensions:
   <itemizedlist>
    <listitem>
     <para>The standard only allows one procedure to be dropped per command.</para>
    </listitem>
    <listitem>
     <para>The <literal>IF EXISTS</literal> option</para>
    </listitem>
    <listitem>
     <para>The ability to specify argument modes and names</para>
    </listitem>
   </itemizedlist></para>
 </refsect1>

 <refsect1>
  <title>See Also</title>

  <simplelist type="inline">
   <member><xref linkend="sql-createprocedure"/></member>
   <member><xref linkend="sql-alterprocedure"/></member>
   <member><xref linkend="sql-dropfunction"/></member>
   <member><xref linkend="sql-droproutine"/></member>
  </simplelist>
 </refsect1>

</refentry>
