How to create a MySQL Trigger

How to create a MySQL Trigger

This is the sintax:

CREATE [DEFINER = { user | CURRENT_USER }]
TRIGGER trigger_name {AFTER | BEFORE} {INSERT | UPDATE | DELETE}
ON tbl_name FOR EACH ROW {your_body}

An example:

CREATE TRIGGER sdata_insert BEFORE INSERT ON `sometable`
 FOR EACH ROW
 BEGIN
  SET NEW.guid = UUID();
 END
;