📄️ CREATE FUNCTION
CREATE FUNCTION creates a user-defined function (UDF), including scalar, aggregate, window, and table functions.
📄️ DROP FUNCTION
DROP FUNCTION deletes a custom function by matching name and parameter types.
📄️ SHOW CREATE FUNCTION
SHOW CREATE FUNCTION returns the CREATE FUNCTION DDL for a user-defined function.
📄️ SHOW FUNCTIONS
SHOW FUNCTIONS queries all custom or built-in functions in a database.
