Question

我使用下面的子查询从我的查询中返回每个（文档编号）的最大数据，但是当我有很多记录时它只返回一条记录。

 SELECT tblTransmittals.[Owner Document Number]
      , tblTransmittals.[Int-Tr-   NO]
      , tbltransmittalNo.[Internal-Tr-Date]

FROM tblTransmittals 
INNER JOIN tbltransmittalNo 
  ON tblTransmittals.[Int-Tr-  NO] = tbltransmittalNo.[Int-Tr-NO]
WHERE (((tbltransmittalNo.[Internal-Tr-Date])=
        (SELECT Max(A.[Internal-Tr-  Date]) 
         FROM (SELECT tblTransmittals.[Owner Document Number]
                    , tbltransmittalNo.   [Internal-Tr-Date]
               FROM tblTransmittals 
               INNER JOIN tbltransmittalNo 
                  ON tblTransmittals.[Int-Tr-NO] = tbltransmittalNo.[Int-Tr-NO]
              ) AS A 
         WHERE A.[owner Document Number]=[tblTransmittals].[Owner Document Number])));

我的意思是如果查询数据如下：

   Owner Document Number    Int-Tr-NO         Internal-Tr-Date
    doc-0001               tt-0002            10-oct-2016
    doc-0001                tt-0003            12-0ct-2017
    doc-0005                tt-0100            18-sep-2015

我希望在使用子查询后返回：

    Owner Document Number    Int-Tr-NO         Internal-Tr-Date

    doc-0001                tt-0003            12-0ct-2017
    doc-0005                tt-0100            18-sep-2015

我试过并检查了一切，但我不知道为什么不起作用？

Answer 1

不完全清楚你想要什么，我假设这是sql server。认为你想要这样的东西。

select *
from
(
    SELECT t.[Owner Document Number]
          , t.[Int-Tr-   NO]
          , tn.[Internal-Tr-Date]
          , RowNum = ROW_NUMBER() over (partition by t.[Owner Document Number] order by tbltransmittalNo.[Internal-Tr-Date] desc)
    FROM tblTransmittals t 
    INNER JOIN tbltransmittalNo tn ON t.[Int-Tr-  NO] = tn.[Int-Tr-NO]
) x
where x.RowNum = 1

Answer 2

 SELECT tblTransmittals.[Owner Document Number], tblTransmittals.[Int-Tr-NO], tbltransmittalNo.[Internal-Tr-Date]

 FROM tblTransmittals INNER JOIN tbltransmittalNo ON tblTransmittals.[Int-Tr-NO] = tbltransmittalNo.[Int-Tr-NO]

 WHERE (((tbltransmittalNo.[Internal-Tr-Date])=

(SELECT Max([Internal-Tr-Date]) 

FROM (SELECT T.[Owner Document Number], T.[Int-Tr-NO], TN.[Internal-Tr-Date]
FROM tblTransmittals AS T LEFT JOIN tbltransmittalNo AS TN ON T.[Int-Tr-NO]   = TN.[Int-Tr-NO]) AS A 

WHERE A.[owner Document Number]=[tblTransmittals].[Owner Document Number])));

Answer 3

您的查询完全不正确，因为它只返回一行，因为您的子查询中有max（）：

(SELECT Max(A.[Internal-Tr-  Date]) 
    FROM (SELECT tblTransmittals.[Owner Document Number], tbltransmittalNo.   [Internal-Tr-Date]
FROM tblTransmittals INNER JOIN tbltransmittalNo 
ON tblTransmittals.[Int-Tr-NO] = tbltransmittalNo.[Int-Tr-NO]) AS A
WHERE A.[owner Document Number]=[tblTransmittals].[Owner Document Number]);
##this query only returns 1 value

在上面的场景中，max（）查询将返回“12-0ct-2017”，您的最终查询将如下所示：

SELECT tblTransmittals。[Owner Document Number]，tblTransmittals。[Int-Tr-NO]，tbltransmittalNo。[Internal-Tr-Date] FROM tblTransmittals INNER JOIN tbltransmittalNo ON tblTransmittals。[Int-Tr-NO] = tbltransmittalNo。[Int-Tr-NO] WHERE（（（tbltransmittalNo。[Internal-Tr-Date]）='20171012'

我猜你想要在每个[所有者文件编号]上返回最大（日期），所以我会这样做：

SELECT A. [所有者文件编号]，A。[Int-Tr-NO]，B。[Internal-Tr-Date] FROM tblTransmittals as INNER JOIN tbltransmittalNo as B ON A. [Int-Tr-NO] = B. [Int-Tr-NO] 加入（选择C. [所有者文件编号]，最大（D. [内部 - 日期]） FROM tblTransmittals as C INNER JOIN tbltransmittalNo as D ON C. [Int-Tr-NO] = D. [Int-Tr-NO] GROUP BY C. [所有者文件编号]）AS E. ON A. [所有者文档编号] = E. [所有者文档编号] 和B. [Internal-Tr-Date] = E. [Internal-Tr-Date]

祝你好运。

子查询无法正常工作

3 个答案: