DROP ROUTINE — remove a routine
DROP ROUTINE [ IF EXISTS ]
name[ ( [ [
argtype[, ...] ] ) ] [, ...] [ CASCADE | RESTRICT ]
DROP ROUTINE removes the definition of one or more existing routines. The term “routine” includes aggregate functions, normal functions, and procedures. See under DROP AGGREGATE, DROP FUNCTION, and DROP PROCEDURE for the description of the parameters, more examples, and further details.
The lookup rules used by
DROP ROUTINE are fundamentally the same as for
DROP PROCEDURE; in particular,
DROP ROUTINE shares that command's behavior of considering an argument list that has no
argmode markers to be possibly using the SQL standard's definition that
OUT arguments are included in the list. (
DROP AGGREGATE and
DROP FUNCTION do not do that.)
In some cases where the same name is shared by routines of different kinds, it is possible for
DROP ROUTINE to fail with an ambiguity error when a more specific command (
DROP FUNCTION, etc.) would work. Specifying the argument type list more carefully will also resolve such problems.
These lookup rules are also used by other commands that act on existing routines, such as
ALTER ROUTINE and
COMMENT ON ROUTINE.
To drop the routine
foo for type
DROP ROUTINE foo(integer);
This command will work independent of whether
foo is an aggregate, function, or procedure.
This command conforms to the SQL standard, with these PostgreSQL extensions:
The standard only allows one routine to be dropped per command.
IF EXISTS option is an extension.
The ability to specify argument modes and names is an extension, and the lookup rules differ when modes are given.
User-definable aggregate functions are an extension.
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