DROP FUNCTION — remove a function
DROP FUNCTIONname( [ [argmode] [argname]argtype[, ...] ] ) [ CASCADE | RESTRICT ]
DROP FUNCTION 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.
nameThe name (optionally schema-qualified) of an existing function.
argmode The mode of an argument: either IN, OUT,
or INOUT. If omitted, the default is IN.
Note that DROP FUNCTION does not actually pay
any attention to OUT arguments, since only the input
arguments are needed to determine the function's identity.
So it is sufficient to list the IN and INOUT
arguments.
argname The name of an argument.
Note that DROP FUNCTION does not actually pay
any attention to argument names, since only the argument data
types are needed to determine the function's identity.
argtypeThe data type(s) of the function's arguments (optionally schema-qualified), if any.
CASCADEAutomatically drop objects that depend on the function (such as operators or triggers).
RESTRICTRefuse to drop the function if any objects depend on it. This is the default.