ALTER TABLE `vn`.`clientLog` 
DROP FOREIGN KEY `clientLog_ibfk_2`;
ALTER TABLE `vn`.`clientLog` 
CHANGE COLUMN `userFk` `userFk` INT(10) UNSIGNED NULL DEFAULT NULL ;
ALTER TABLE `vn`.`clientLog` 
ADD CONSTRAINT `clientLog_ibfk_2`
  FOREIGN KEY (`userFk`)
  REFERENCES `account`.`user` (`id`)
  ON DELETE CASCADE
  ON UPDATE CASCADE;