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CREATE TABLE tracks (name varchar(64), type varchar(64), reference_date timestamp); DROP TRIGGER IF EXISTS update_tracks_trigger; DELIMITER $$ CREATE TRIGGER update_tracks_trigger BEFORE UPDATE ON tracks FOR EACH ROW BEGIN IF (NEW.name != OLD.name || NEW.type != OLD.type) THEN SET NEW.reference_date = CURRENT_TIMESTAMP(3); END IF; END; $$ DELIMITER ;
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