Easy for anyone.

delimiter $$ DROP FUNCTION IF EXISTS dbname.string_print$$ CREATE FUNCTION dbname.string_print( str VARCHAR(20) ) RETURNS VARCHAR(20) BEGIN DECLARE copy_str VARCHAR(20); SET copy_str = str; RETURN copy_str; END $$ delimiter ; SELECT dbname.string_print('Hello world'); delimiter $$ DROP PROCEDURE IF EXISTS dbname.string_print$$ CREATE PROCEDURE dbname.string_print( str VARCHAR(20) ) BEGIN DECLARE..