DROP FUNCTION - MySQL

Overview

DROP FUNCTION removes a previously created stored or user-defined function from the MySQL database. It permanently deletes the function definition and its associated metadata.

Syntax

DROP FUNCTION [IF EXISTS] function_name

Options/Flags

  • IF EXISTS: Optionally checks if the function exists before attempting to drop it. If the function doesn’t exist, the command will not generate an error.

Examples

Dropping a Function

DROP FUNCTION my_function;

Dropping a Function with IF EXISTS

DROP FUNCTION IF EXISTS my_function;

Common Issues

  • Function Not Found: Ensure the function exists in the database before attempting to drop it. Use IF EXISTS to avoid errors.
  • Dependencies: Functions may have dependencies on other objects, such as tables. Dropping such functions may cause errors or unexpected behavior. Check for dependencies before dropping.
  • Privileges: Users require the DROP FUNCTION privilege to execute this command.

Integration

  • Combine with CREATE FUNCTION to manage function definitions.
  • Use SHOW FUNCTIONS to check the status and metadata of functions.
  • Utilize GRANT and REVOKE to control user access to functions.
  • CREATE FUNCTION
  • ALTER FUNCTION
  • CALL
  • GRANT
  • REVOKE