统计每个部门中人数() A.SELECT SUM(ID) FROM EMP GROUP BY DEPTNO; B.SELECT SUM(I
统计每个部门中人数()
A.SELECT SUM(ID) FROM EMP GROUP BY DEPTNO;
B.SELECT SUM(ID) FROM EMP ORDER BY DEPTNO;
C.SELECT COUNT(ID) FROM EMP ORDER BY DEPTNO;
D.SELECT COUNT(ID) FROM EMP GROUP BY DEPTNO;