单项选择题
A．实体完整性约束 B．触发器 C．参照完整性约束 D．视图
A．主变量 B．游标 C．SQLCA D．SQL语句
A．GRANT update on Emp TO LIU WITH CHECK OPTION B．GRANT update(empname) on Emp TO LIU WITH CHECK OPTION C．GRANT update on Emp TO LIU WITH GRANT OPTION D．GRANT update(empname) on Emp TO LIU WITH GRANT OPTION