USE `vn`; ALTER TABLE `vn`.`awb` ADD invoiceInPaletizedFk INT NULL; ALTER TABLE `vn`.`awb` MODIFY COLUMN invoiceInPaletizedFk mediumint(8) unsigned NULL; ALTER TABLE `vn`.`awb` ADD CONSTRAINT awb_FK_3 FOREIGN KEY (invoiceInPaletizedFk) REFERENCES vn.invoiceIn(id) ON DELETE RESTRICT ON UPDATE CASCADE;