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PostgreSQL documentation
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<refentry id="SQL-DROPFUNCTION">
 <refmeta>
  <refentrytitle id="SQL-DROPFUNCTION-TITLE">DROP FUNCTION</refentrytitle>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname>DROP FUNCTION</refname>
  <refpurpose>remove a user-defined function</refpurpose>
 </refnamediv>

 <refsynopsisdiv>
<synopsis>
DROP FUNCTION <replaceable class="parameter">name</replaceable> ( [ <replaceable class="parameter">type</replaceable> [, ...] ] ) [ CASCADE | RESTRICT ]
</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

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

 <refsect1>
  <title>Parameters</title>

  <variablelist>
   <varlistentry>
    <term><replaceable class="parameter">name</replaceable></term>
    <listitem>
     <para>
      The name (optionally schema-qualified) of an existing function.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">type</replaceable></term>
    <listitem>
     <para>
      The data type of an argument of the function.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>CASCADE</literal></term>
    <listitem>
     <para>
      Automatically drop objects that depend on the function (such as
      operators or triggers).
     </para>
    </listitem>
   </varlistentry>

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

 <refsect1>
  <title>Diagnostics</title>

  <variablelist>
   <varlistentry>
    <term><computeroutput>DROP FUNCTION</computeroutput></term>
    <listitem>
     <para>
      Message returned if the command completes successfully.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><computeroutput>WARNING:  RemoveFunction: Function <replaceable class="parameter">name</replaceable> (<replaceable class="parameter">types</replaceable>) does not exist</computeroutput></term>
    <listitem>
     <para>
      This message is output if the function specified does not exist.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1 id="SQL-DROPFUNCTION-examples">
  <title>Examples</title>

  <para>
   This command removes the square root function:

<programlisting>
DROP FUNCTION sqrt(integer);
</programlisting>
  </para>
 </refsect1>

 <refsect1 id="SQL-DROPFUNCTION-compatibility">
  <title>Compatibility</title>
  
  <para>
   A <command>DROP FUNCTION</command> statement is defined in the SQL
   standard, but it is not compatible with this command.
  </para>
 </refsect1>

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

  <simplelist type="inline">
   <member><xref linkend="sql-createfunction" endterm="sql-createfunction-title"></member>
   <member><xref linkend="sql-alterfunction" endterm="sql-alterfunction-title"></member>
  </simplelist>
 </refsect1>

</refentry>

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