多项选择题

A.Select * From Emp Where EmpNO Not In('791','792','793') 
B.Select * From Emp Where EmpNO !='791' AND EmpNO!='792' And EmpNO='793' 
C.Select * From Emp Where EmpNO <>'791' AND EmpNO<>792' And EmpNO=<>793' 
D.Select * From Emp Where EmpNO =!'791' AND EmpNO =!'792' And EmpNO =!'793'