text: ALTER TABLE `event`
      ADD COLUMN `discipline_id` varchar(45) not null;
  
  ALTER TABLE `event`
      ADD COLUMN `description` varchar(45);
  
  ALTER TABLE `event`
      ADD CONSTRAINT `event_discipline`
      FOREIGN KEY (`discipline_id`)
      REFERENCES `discipline`(`id`)
      ON UPDATE RESTRICT
      ON DELETE RESTRICT;
  