如果其中一列是相同的 Sql-server，则删除重复的行

Question

我有一个查询，它链接 table 一二 table 二并获取 table 中结果的最后一条评论，这有效但是当有来自 table 例如，具有相同 ID 的结果再次显示为示例

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

如您所见，有两条机器号为 1 的记录，一条在早上创建，一条在中午创建，但我只想显示最新的一条，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 您可以按机器 ID 对数据进行分区，并按日期对数字进行排序。比你可以只使用一个简单的 where clouse select 你想要的

;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

也许这样的事情会奏效。

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

removing duplicate rows if one of the columns are the same Sql-server

php

sql-server