A.select * from products where vend_id=1002 or vend_id=1003 B.select * from products where vend_id in(1002,1003); C.select * from products where vend_id not in(1004,1005); D.select * from products where vend_id=1002and vend_id=1003
A.db1/student B.db1.student C.db1_student D.db1&student
A.聲明后必須打開(kāi)游標(biāo)以供使用 B.結(jié)束游標(biāo)使用時(shí),必須閉游標(biāo) C.使用游標(biāo)前必須聲明它 D.游標(biāo)只能用于存儲(chǔ)過(guò)程和函數(shù)