icarnegieSSD7数据库课程选择题1.AnE-Commercedatabasecontainsdataaboutcustomers,products,orders,systemresponsetimes,etc.WhichofthefollowingcanbespecifiedasintegrityconstraintsinanE-Commercedatabasesystem?NotwoproductscanhavethesameproductID.TheDBMSresponsetimeforallWebrequestsshouldbeatm