A.create user jack@'%' identified by'123456'; B.drop user jack@'localhost'; C.add user jack@'%' identified by'123456'; D.alter user jack@'localhost' identified by'123456';
A.drop user jerry@’localhost’; B.create user jerry@’%’; C.delete userjerry@’localhost’; D.drop user jerry@’%’;
A.create B.drop C.grant D.revoke