EMPLOYEES和DEPARTMENTS表有2个等义命名字段：DEPARTMENT_ID 和 MANAGER_ID。如下哪些语句基于DEPARTMENT_ID进行等值连接？D A 2.SELECT * FROM EMPLOYEES NATURAL JOIN DEPARTMENTS USING (DEPARTMENT_ID); B 1.SELECT * FROM EMPLOYEES NATURAL JOIN DEPARTMENTS; C 3.SELECT * FROM EMPLOYEES E NATURAL JOIN DEPARTMENTS D ON E.DEPARTMENT_ID=D.DEPARTMENT_ID; D 以上都不对