IF not EXISTS( SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'Product' AND  COLUMN_NAME = 'Tarikh')
begin
	alter table dbo.Product add Tarikh	int null
end;
IF not EXISTS( SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'Product' AND  COLUMN_NAME = 'Saat')
begin
	alter table dbo.Product add Saat	int null
end