在表emp中,将员工号eNum为01099的员工的salary增加300的语句是
A.UPDATE emp SET salary+=300 where eNum='01099';
B.UPDATE emp SET salary=salary+300 where eNum='01099';
C.ALTER TABLE emp SET salary=salary+300 where eNum='01099';
D.ALTER TABLE emp SET salary+=300 where eNum='01099';