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><H1
><A
NAME="SQL-ALTERFUNCTION"
></A
>ALTER FUNCTION</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN39044"
></A
><H2
>Name</H2
>ALTER FUNCTION -- change the definition of a function</DIV
><A
NAME="AEN39047"
></A
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN39049"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>ALTER FUNCTION <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
> [, ...] ] )
<TT
CLASS="REPLACEABLE"
><I
>action</I
></TT
> [, ... ] [ RESTRICT ]
ALTER FUNCTION <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
> [, ...] ] )
RENAME TO <TT
CLASS="REPLACEABLE"
><I
>new_name</I
></TT
>
ALTER FUNCTION <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
> [, ...] ] )
OWNER TO <TT
CLASS="REPLACEABLE"
><I
>new_owner</I
></TT
>
ALTER FUNCTION <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
> [, ...] ] )
SET SCHEMA <TT
CLASS="REPLACEABLE"
><I
>new_schema</I
></TT
>
where <TT
CLASS="REPLACEABLE"
><I
>action</I
></TT
> is one of:
CALLED ON NULL INPUT | RETURNS NULL ON NULL INPUT | STRICT
IMMUTABLE | STABLE | VOLATILE
[ EXTERNAL ] SECURITY INVOKER | [ EXTERNAL ] SECURITY DEFINER</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN39072"
></A
><H2
>Description</H2
><P
> <TT
CLASS="COMMAND"
>ALTER FUNCTION</TT
> changes the definition of a
function.
</P
><P
> You must own the function to use <TT
CLASS="COMMAND"
>ALTER FUNCTION</TT
>.
To change a function's schema, you must also have <TT
CLASS="LITERAL"
>CREATE</TT
>
privilege on the new schema.
To alter the owner, you must also be a direct or indirect member of the new
owning role, and that role must have <TT
CLASS="LITERAL"
>CREATE</TT
> privilege on
the function's schema. (These restrictions enforce that altering the owner
doesn't do anything you couldn't do by dropping and recreating the function.
However, a superuser can alter ownership of any function anyway.)
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN39080"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><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: either <TT
CLASS="LITERAL"
>IN</TT
>, <TT
CLASS="LITERAL"
>OUT</TT
>,
or <TT
CLASS="LITERAL"
>INOUT</TT
>. If omitted, the default is <TT
CLASS="LITERAL"
>IN</TT
>.
Note that <TT
CLASS="COMMAND"
>ALTER 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
> and <TT
CLASS="LITERAL"
>INOUT</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"
>ALTER 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="REPLACEABLE"
><I
>new_name</I
></TT
></DT
><DD
><P
> The new name of the function.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>new_owner</I
></TT
></DT
><DD
><P
> The new owner of the function. Note that if the function is
marked <TT
CLASS="LITERAL"
>SECURITY DEFINER</TT
>, it will subsequently
execute as the new owner.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>new_schema</I
></TT
></DT
><DD
><P
> The new schema for the function.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>CALLED ON NULL INPUT</TT
><BR><TT
CLASS="LITERAL"
>RETURNS NULL ON NULL INPUT</TT
><BR><TT
CLASS="LITERAL"
>STRICT</TT
></DT
><DD
><P
> <TT
CLASS="LITERAL"
>CALLED ON NULL INPUT</TT
> changes the function so
that it will be invoked when some or all of its arguments are
null. <TT
CLASS="LITERAL"
>RETURNS NULL ON NULL INPUT</TT
> or
<TT
CLASS="LITERAL"
>STRICT</TT
> changes the function so that it is not
invoked if any of its arguments are null; instead, a null result
is assumed automatically. See <A
HREF="sql-createfunction.html"
>CREATE FUNCTION</A
> for more information.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>IMMUTABLE</TT
><BR><TT
CLASS="LITERAL"
>STABLE</TT
><BR><TT
CLASS="LITERAL"
>VOLATILE</TT
></DT
><DD
><P
> Change the volatility of the function to the specified
setting. See <A
HREF="sql-createfunction.html"
>CREATE FUNCTION</A
> for details.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>[<SPAN
CLASS="OPTIONAL"
> EXTERNAL </SPAN
>] SECURITY INVOKER</TT
><BR><TT
CLASS="LITERAL"
>[<SPAN
CLASS="OPTIONAL"
> EXTERNAL </SPAN
>] SECURITY DEFINER</TT
></DT
><DD
><P
> Change whether the function is a security definer or not. The
key word <TT
CLASS="LITERAL"
>EXTERNAL</TT
> is ignored for SQL
conformance. See <A
HREF="sql-createfunction.html"
>CREATE FUNCTION</A
> for more
information about this capability.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>RESTRICT</TT
></DT
><DD
><P
> Ignored for conformance with the SQL standard.
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN39167"
></A
><H2
>Examples</H2
><P
> To rename the function <TT
CLASS="LITERAL"
>sqrt</TT
> for type
<TT
CLASS="TYPE"
>integer</TT
> to <TT
CLASS="LITERAL"
>square_root</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER FUNCTION sqrt(integer) RENAME TO square_root;</PRE
><P>
</P
><P
> To change the owner of the function <TT
CLASS="LITERAL"
>sqrt</TT
> for type
<TT
CLASS="TYPE"
>integer</TT
> to <TT
CLASS="LITERAL"
>joe</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER FUNCTION sqrt(integer) OWNER TO joe;</PRE
><P>
</P
><P
> To change the schema of the function <TT
CLASS="LITERAL"
>sqrt</TT
> for type
<TT
CLASS="TYPE"
>integer</TT
> to <TT
CLASS="LITERAL"
>maths</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER FUNCTION sqrt(integer) SET SCHEMA maths;</PRE
><P>
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN39184"
></A
><H2
>Compatibility</H2
><P
> This statement is partially compatible with the <TT
CLASS="COMMAND"
>ALTER
FUNCTION</TT
> statement in the SQL standard. The standard allows more
properties of a function to be modified, but does not provide the
ability to rename a function, make a function a security definer,
or change the owner, schema, or volatility of a function. The standard also
requires the <TT
CLASS="LITERAL"
>RESTRICT</TT
> key word, which is optional in
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN39190"
></A
><H2
>See Also</H2
><A
HREF="sql-createfunction.html"
><I
>CREATE FUNCTION</I
></A
>, <A
HREF="sql-dropfunction.html"
><I
>DROP FUNCTION</I
></A
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