3、 UNION SELECT*FROMtblWHEREcust_id=180 UNION SELECT*FROMtblWHEREcust_id=560 D、SELECT*FROMtblWHEREland_id>750 UNION (SELECT*FROMtblWHEREcust_id=180 UNIONALL SELECT*FROMtblWHEREcust_id=560 )6、AtableCANNOThaveoneormoreofthefollowingindexconfigurations.正确答案:DA、NoindexesB、Acl