Question

我没有想到结果。我尝试过使用：

DELETE FROM emp c
WHERE SAL IN (
    SELECT SAL
    FROM EMP A
    WHERE DEPTNO IN (
        SELECT DEPTNO
        FROM DEPT
        WHERE LOC IN ('DALLAS')
    )
    AND 4 = (
        SELECT COUNT(*)
        FROM EMP B
        WHERE A.SAL< B.SAL
    )
);

Answer 1

DELETE FROM emp c
WHERE SAL IN (
    SELECT TOP 1
        sub1.SAL
    FROM (
        SELECT TOP 5
            SAL
        FROM EMP A
        inner join DEPT ON a.DEPTNO=DEPT.DEPTNO and DEPT.LOC='DALLAS'
        ORDER BY SAL DESC
    ) sub1
    ORDER BY sub1.SAL ASC
);

Answer 2

薪水等级必须有助于检测第5个最高工资：

DELETE FROM emp where sal in(
   select sal from(
         SELECT sal, RANK() OVER (order by sal DESC) myrank
            FROM emp)
    where myrank=5
)
   and  DEPTNO IN (
    SELECT DEPTNO
    FROM DEPT
    WHERE LOC IN ('DALLAS')

如果您希望第5个工资在达拉斯的某个部门内，即不是所有工资，请尝试这样的事情：

DELETE FROM emp where sal in(
   select sal from(
         SELECT sal, RANK() OVER (partition by depno order by sal DESC) myrank
            FROM emp)
    where myrank=5
)
   and  DEPTNO IN (
    SELECT DEPTNO
    FROM DEPT
    WHERE LOC IN ('DALLAS')

如何从emp表中删除第5个最高工资，他也应该来自dept表中的dallas

2 个答案: