IF not EXISTS( SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'ProductDetail' AND  COLUMN_NAME = 'Far_ID_BedehKar')
begin
	ALTER TABLE		ProductDetail add Far_ID_BedehKar	int references Farayand(Code) null
end
IF not EXISTS( SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'ProductDetail' AND  COLUMN_NAME = 'Taf_ID_BedehKar')
begin
	ALTER TABLE		ProductDetail add Taf_ID_BedehKar	bigint references Tafsili(Code) null
end