📄️ CREATE FUNCTION
CREATE FUNCTION creates a user-defined function (UDF).
📄️ DROP FUNCTION
DROP FUNCTION deletes a custom function.
📄️ SHOW CREATE FUNCTION
SHOW CREATE FUNCTION returns the CREATE FUNCTION DDL for a user-defined function.
📄️ SHOW FUNCTIONS
SHOW FUNCTIONS queries all the custom (or built-in) functions under a database.
