如何仅突出显示与其经理在同一部门工作的员工？

Question

到目前为止，我有以下内容：

SELECT Emp.Empno as "Emp#", Emp.Ename as "Employee", Emp.Deptno as "Department", Emp.Mgr as "Mgr#", M.Ename as "Manager",
FROM Emp
LEFT OUTER JOIN Emp M ON Emp.Mgr = M.Empno;

结果：

      Emp# Employee       DEPTNO       Mgr# Manager
---------- ---------- ---------- ---------- ----------
      7902 FORD               20       7566 JONES
      7788 SCOTT              20       7566 JONES
      7900 JAMES              30       7698 BLAKE
      7844 TURNER             30       7698 BLAKE
      7654 MARTIN             30       7698 BLAKE
      7521 WARD               30       7698 BLAKE
      7499 ALLEN              30       7698 BLAKE
      7934 MILLER             10       7782 CLARK
      7876 ADAMS              20       7788 SCOTT
      7782 CLARK              10       7839 KING
      7698 BLAKE              30       7839 KING
      7566 JONES              20       7839 KING
      7369 SMITH              20       7902 FORD
      7839 KING               10

但是，我还需要知道如何从我的结果中删除Employee的DEPTNO与其各自经理（如果有的话）的DEPTNO不匹配的行。

我真的很累，已经坚持了几个小时。

Answer 1

你可以在你的sql中添加一个where子句，只选择经理和员工deptno是否相同

SELECT E.Empno as "Emp#", E.Ename as "Employee", E.Deptno as "Department", E.Mgr as "Mgr#", M.Ename as "Manager"
FROM Emp E
LEFT OUTER JOIN Emp M ON E.Mgr = M.Empno
WHERE E.Deptno = M.Deptno;