Question

我有一个INNER JOIN查询，它本身运行得很好，我想LEFT JOIN到包含WHERE子句的另一个查询/ SELECT语句。我无法加入这两个查询。它应该链接wt.tkinit = t.tkinit 你能否提出我缺少的东西。

SELECT c.clnum, m.mmatter, ot.tkinit AS 'otkinit', wt.tkinit AS 'wtikint', t.tkrt01,
SUM(mt.mthrwkdb) AS 'whrs2010',
FROM client c, matter m, timekeep ot, timekeep wt, mattimhs mt, periodt p, timerate t
WHERE c.clnum = m.mclient
AND m.mmatter = mt.mtmatter
GROUP BY c.clnum, m.mmatter, ot.tkinit, wt.tkinit

SELECT t.tkinit, t.tkrt01
FROM timerate t
INNER JOIN (
SELECT tkinit, max(tkeffdate) as max_effdate 
FROM timerate WHERE DATEPART(year, tkeffdate) = '2012'
GROUP BY tkinit) mt ON mt.tkinit = t.tkinit AND mt.max_effdate = t.tkeffdate

Answer 1

您是否尝试过以下操作：

SELECT fields from (SELECT1) s1 
  LEFT JOIN 
  (SELECT2) s2 
  on s1.wt.tkinit = s2.t.tkinit.

不要忘记在wt.tkinit和t.tkinit中选择正常的名称，例如wt_tkinit和t_tkinit，因为你不能做双重别名。

Answer 2

SELECT temp2.tkinit, temp2.tkrt01, temp.clnum, temp.mmatter, temp.otkinit, temp.tkrt01, temp.whrs2010
FROM
    ( SELECT c.clnum, m.mmatter, ot.tkinit AS 'otkinit', wt.tkinit AS 'wtikint', t.tkrt01,
    SUM(mt.mthrwkdb) AS 'whrs2010',
    FROM client c, matter m, timekeep ot, timekeep wt, mattimhs mt, periodt p, timerate t
    WHERE c.clnum = m.mclient
    AND m.mmatter = mt.mtmatter
    GROUP BY c.clnum, m.mmatter, ot.tkinit, wt.tkinit ) temp
LEFT JOIN 
    SELECT t.tkinit, t.tkrt01
    FROM timerate t
    INNER JOIN (
    SELECT tkinit, max(tkeffdate) as max_effdate 
    FROM timerate WHERE DATEPART(year, tkeffdate) = '2012'
    GROUP BY tkinit) mt ON mt.tkinit = t.tkinit AND mt.max_effdate = t.tkeffdate ) temp2
ON temp.wtikint = temp2.tkinit

小心你的字段名称，但这可能是一个开始

Left加入另一个select语句

2 个答案: