DROP FUNCTION
command to remove an existing user-defined function (UDF).
Syntax
Parameter or clause | Description |
---|---|
function_name | Name of the UDF you want to drop. |
( argument_type [ , … ] ) | Optional: Argument types of the function.Specify the argument types when the name of the function you want to drop isn’t unique within the schema. |
IF EXISTS | Do not return an error if the specified function does not exist. A notice is issued in this case. |
CASCADE option | If this option is specified, all objects (such as materialized views) that depend on the function, and in turn all objects that depend on those objects will be dropped. |
Usage
A function can be dropped using one of the following methods:- Full function signature:
- Function name only, if it’s unique in its schema:
DROP FUNCTION function_name();
drops a function with zero arguments.DROP FUNCTION function_name;
drops a function with any number of arguments, including zero, as long as the name is unique.Examples
First, let’s create some functions.f1(int,int)
is the only function named f1
, you can drop it by name or full signature: