你可能感興趣的試題

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