Question

我有这样的查询：

SELECT SUM(tab1.amount) amount
FROM tab1
JOIN tab2
  ON tab1.lp_id = tab2.id
JOIN tab3
  ON tab3.employee_id = tab2.employee_id
WHERE tab1.officeid =123
  AND tab3.space <> 2

这很好用。现在我想为它添加一些过滤器。基本上我有一个表tab4，其中我有employee_id，effective_date，salary列。即对于每个员工，我们维护工资变更的日期（即每位员工多个记录）。我只想挑选最近薪水超过10000的员工。我该怎么写呢？基本上我想要这样的东西：

SELECT SUM(tab1.amount) amount
FROM tab1
JOIN tab2
   ON tab1.lp_id = tab2.id
JOIN tab3
   ON tab3.employee_id            = tab2.employee_id
WHERE tab1.officeid     =123
   AND tab3.space <> 2
   AND (
        select salary 
        from (
              select * 
              from tab4 
              where  tab4.employee_id  = tab2.employee_id
              order by effective_d desc
              )  
        where rownum = 1
        ) > 10000

我正在尝试添加最后两行 - 但是我收到错误，因为我无法使用tab2.employee_id。

我该怎么写呢？

Answer 1

怎么样

SELECT      t.employee_id, t.salary
FROM        tab4 t
INNER JOIN  (SELECT     employee_id, MAX(effective_date) as eff_date
            FROM        tab4
            GROUP BY    employee_id) x
            ON t.employee_id = x.employee_id AND t.effective_date = x.eff_date
WHERE       t.salary > 10000

这将使您的员工薪水大于10000

Answer 2

您是否尝试过使用INTERSECT运营商？

SELECT SUM(tab1.amount) amount
FROM tab1
JOIN tab2
   ON tab1.lp_id = tab2.id
JOIN tab3
   ON tab3.employee_id            = tab2.employee_id
WHERE tab1.officeid     =123
   AND tab3.space <> 2
INTERSECT(
        select salary 
        from (
              select * 
              from tab4, tab2
              where  tab4.employee_id  = tab2.employee_id
              order by effective_d desc
              )  
        where rownum = 1
        ) > 10000

Answer 3

尝试这样的事情： -

SELECT SUM(tab1.amount) amount
FROM tab1
JOIN tab2
ON tab1.lp_id = tab2.id
JOIN tab3
ON tab3.employee_id = tab2.employee_id
WHERE tab1.officeid     =123
AND tab3.space <> 2
AND (
     select salary 
     from (
          select * 
          from tab4 join tab2
          on tab4.employee_id  = tab2.employee_id
          order by effective_d desc
          )  
    where rownum = 1
    ) > 10000

希望这可以帮到你。

我该如何编写这个SQL查询？

3 个答案: