Mysql 左连接到另一个select语句

我有一个

内部联接

查询，它本身运行得非常好，我想

将其左联接

到另一个查询/

选择

语句，该语句包含WHERE子句。 我无法同时加入这两个查询。它应该链接

wt.tkinit=t.tkinit

你能告诉我我遗漏了什么吗

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

---

您是否尝试过以下方法：

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等选项中为wt.tkinit和t.tkinit取正常名称，因为您不能使用双别名。

您是否尝试了以下方法：

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

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

不要忘记在它们的选择中为wt.tkinit和t.tkinit取普通名称，比如wt_-tkinit和t_-tkinit，因为不能使用双别名

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

注意字段名，但这可能是一个开始

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小心你的字段名，但这可能是一个开始

我收到这条错误消息检查你的字段名我收到这条错误消息检查你的字段名对不起，运气不好。s1和s2代表什么。临时表？这是您的两个查询。将其替换为SELECT1和select2担心运气不佳。s1和s2代表什么。临时表？这是您的两个查询。将其放置，而不是选择1和选择2