Question

我有一个查询链接表一两个表二并获得表1中结果的最后一个注释，但是当有一个具有相同ID的表中的多个记录时，它会再次显示结果一个例子

查询结果

ID | Machine | description | createdtime |  product code |  work order | qty  | comment | Reson
        No
129  |1 |  A name | 2015-01-08 07:38:41.427 | A code  |   12/14/0038 |  4000  | comment   | Reason
143  |1 |  A name | 2015-01-08 13:30:39.403 | A code  |   12/14/0038 |  4000  | comment    | Reson
130  |4 |  A name | 2015-01-08 07:38:46.540 | A code  |   12/14/0045 |  12000 | comment   | Reason
131  |5 |  A name | 2015-01-08 07:38:50.243 | A code  |   01/15/0001 |  4000  | comment   | Reason

正如你在这里看到的那样，有两个机器编号为1的记录，一个在早上创建，一个在中午之后创建，但是我只想要显示最新版本，这是我的查询。

SELECT     Qualitycontrol.ID, Qualitycontrol.MachineNo, Qualitycontrol.Description,        Qualitycontrol.CreatedTime, Qualitycontrol.ProductCode, Qualitycontrol.WorkOrder, 
              Qualitycontrol.Quantity, Qc.Comment, Qc.Reason
FROM         Qualitycontrol 
OUTER APPLY (
  SELECT TOP 1 *
FROM QualityControl_Comments
WHERE Qualitycontrol.ID = QCUID
ORDER BY Qualitycontrol.ID DESC -- whatevet defines order in QualityControl_Comments
) AS Qc                  
WHERE     (Qualitycontrol.CreatedTime BETWEEN CAST(GETDATE() AS DATE) AND DATEADD(DAY, 1,     CAST(GETDATE() AS DATE)))
ORDER BY Qualitycontrol.MachineNo

Answer 1

你可以使用这样的东西。使用row_number，您可以按照machnine id对数据进行分区，并按日期对数字进行排序。你可以使用一个简单的clouse来选择你想要的东西

;WITH CTE
as
(
SELECT     Qualitycontrol.ID, Qualitycontrol.MachineNo, Qualitycontrol.Description,        Qualitycontrol.CreatedTime, Qualitycontrol.ProductCode, Qualitycontrol.WorkOrder, 
              Qualitycontrol.Quantity, Qc.Comment, Qc.Reason
FROM         Qualitycontrol 
OUTER APPLY (
  SELECT TOP 1 *
FROM QualityControl_Comments
WHERE Qualitycontrol.ID = QCUID

) AS Qc                  
WHERE     (Qualitycontrol.CreatedTime BETWEEN CAST(GETDATE() AS DATE) AND DATEADD(DAY, 1,     CAST(GETDATE() AS DATE)))

), CTE2 as 
(
select *, row_number() over(partition by MachineNo order by CreatedTime desc) as 'row_index' from cte
)
select * from cte2
where row_index = 1
order by MachineNo

Answer 2

也许这样的事情会起作用。

SELECT     Qualitycontrol.ID, Qualitycontrol.MachineNo, Qualitycontrol.Description,        Qualitycontrol.CreatedTime, Qualitycontrol.ProductCode, Qualitycontrol.WorkOrder, 
              Qualitycontrol.Quantity, Qc.Comment, Qc.Reason
FROM         Qualitycontrol 
OUTER APPLY (
  SELECT TOP 1 *
FROM QualityControl_Comments
WHERE Qualitycontrol.ID = QualityControl_Comments.QCUID
ORDER BY Qualitycontrol.ID DESC -- whatevet defines order in QualityControl_Comments
) AS Qc                  
INNER JOIN 
(
    SELECT Qualitycontrol.MachineNo, MAX(Qualitycontrol.ID) MID
    FROM Qualitycontrol
    GROUP BY Qualitycontrol.MachineNo
) UNQ ON UNQ.MID = Qualitycontrol.ID
WHERE     (Qualitycontrol.CreatedTime BETWEEN CAST(GETDATE() AS DATE) AND DATEADD(DAY, 1,     CAST(GETDATE() AS DATE)))
ORDER BY Qualitycontrol.MachineNo

如果其中一列是相同的Sql-server，则删除重复的行

2 个答案: