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><H1
><A
NAME="SQL-DROPFUNCTION"
></A
>DROP FUNCTION</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN73797"
></A
><H2
>Name</H2
>DROP FUNCTION -- remove a function</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN73802"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>DROP FUNCTION [ IF EXISTS ] <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> ( [ [ <TT
CLASS="REPLACEABLE"
><I
>argmode</I
></TT
> ] [ <TT
CLASS="REPLACEABLE"
><I
>argname</I
></TT
> ] <TT
CLASS="REPLACEABLE"
><I
>argtype</I
></TT
> [, ...] ] )
[ CASCADE | RESTRICT ]</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN73808"
></A
><H2
>Description</H2
><P
> <TT
CLASS="COMMAND"
>DROP FUNCTION</TT
> 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
can exist with the same name and different argument lists.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN73812"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>IF EXISTS</TT
></DT
><DD
><P
> Do not throw an error if the function does not exist. A notice is issued
in this case.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
></DT
><DD
><P
> The name (optionally schema-qualified) of an existing function.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>argmode</I
></TT
></DT
><DD
><P
> The mode of an argument: <TT
CLASS="LITERAL"
>IN</TT
>, <TT
CLASS="LITERAL"
>OUT</TT
>,
<TT
CLASS="LITERAL"
>INOUT</TT
>, or <TT
CLASS="LITERAL"
>VARIADIC</TT
>.
If omitted, the default is <TT
CLASS="LITERAL"
>IN</TT
>.
Note that <TT
CLASS="COMMAND"
>DROP FUNCTION</TT
> does not actually pay
any attention to <TT
CLASS="LITERAL"
>OUT</TT
> arguments, since only the input
arguments are needed to determine the function's identity.
So it is sufficient to list the <TT
CLASS="LITERAL"
>IN</TT
>, <TT
CLASS="LITERAL"
>INOUT</TT
>,
and <TT
CLASS="LITERAL"
>VARIADIC</TT
> arguments.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>argname</I
></TT
></DT
><DD
><P
> The name of an argument.
Note that <TT
CLASS="COMMAND"
>DROP FUNCTION</TT
> does not actually pay
any attention to argument names, since only the argument data
types are needed to determine the function's identity.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>argtype</I
></TT
></DT
><DD
><P
> The data type(s) of the function's arguments (optionally
schema-qualified), if any.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>CASCADE</TT
></DT
><DD
><P
> Automatically drop objects that depend on the function (such as
operators or triggers).
</P
></DD
><DT
><TT
CLASS="LITERAL"
>RESTRICT</TT
></DT
><DD
><P
> Refuse to drop the function if any objects depend on it. This
is the default.
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="SQL-DROPFUNCTION-EXAMPLES"
></A
><H2
>Examples</H2
><P
> This command removes the square root function:
</P><PRE
CLASS="PROGRAMLISTING"
>DROP FUNCTION sqrt(integer);</PRE
><P></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="SQL-DROPFUNCTION-COMPATIBILITY"
></A
><H2
>Compatibility</H2
><P
> A <TT
CLASS="COMMAND"
>DROP FUNCTION</TT
> statement is defined in the SQL
standard, but it is not compatible with this command.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN73869"
></A
><H2
>See Also</H2
><A
HREF="sql-createfunction.html"
>CREATE FUNCTION</A
>, <A
HREF="sql-alterfunction.html"
>ALTER FUNCTION</A
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