ALTER TABLE `vn`.`business` MODIFY COLUMN workcenterFk int(11) NULL;

UPDATE `vn`.`business` b
	SET b.workcenterFk = NULL
	WHERE b.workcenterFk = 0;

ALTER TABLE `vn`.`business`
	ADD INDEX IF NOT EXISTS `business_workcenterFk_idx` (`workcenterFk` ASC);

ALTER TABLE `vn`.`business`
	ADD CONSTRAINT `business_workcenterFk`
		FOREIGN KEY IF NOT EXISTS (`workcenterFk`)
		REFERENCES `vn`.`workCenter` (`id`)
		ON DELETE RESTRICT
		ON UPDATE CASCADE;