-- Place your SQL code here

ALTER TABLE IF EXISTS vn.itemShelvingSaleReserve
ADD IF NOT EXISTS sectorFk int(11) NULL;

ALTER TABLE IF EXISTS vn.itemShelvingSaleReserve
DROP FOREIGN KEY IF EXISTS itemShelvingSaleReserve_sector_FK;

ALTER TABLE IF EXISTS vn.itemShelvingSaleReserve
ADD CONSTRAINT itemShelvingSaleReserve_sector_FK FOREIGN KEY (id)
REFERENCES vn.sector(id) ON DELETE RESTRICT ON UPDATE CASCADE;