如何查找表中的重复数据

Question

我正试图在同一个表中的3列中查找重复的数据。我正在寻找具有相同参考号的任何订单，前提条件& DatePlaced。

例如，由于所有三个标准都得到满足，因此将显示DatePlaced 02/08/17从PremiseId 67890的参考号为12345的订单。

这是我到目前为止，这是从本网站上的另一个答案采取的。

SELECT ReferenceNumber, PremiseId, DatePlaced 
FROM [ypolive_Integration].[dbo].[OrderHeaders] 
WHERE ReferenceNumber in 
(SELECT ReferenceNumber FROM [ypolive_Integration].[dbo].[OrderHeaders] 
GROUP BY ReferenceNumber 
HAVING COUNT(*)>1) 

Order By DatePlaced desc 

这是返回结果ReferenceNumber，PremiseId & DatePlaced。但是，这显示了所有数据，我只希望它显示符合所有三个条件的重复项。

我在这种事情上是非常多的新手，所以如果这是完全错误的道歉！

现在这解决了下面的代码：

select ReferenceNumber, PremiseId , CONVERT(VARCHAR(10),DatePlaced, 112) as 
DatePlaced,count(1) as cnt 
from [ypolive_Integration].[dbo].[OrderHeaders] 
group by ReferenceNumber, PremiseId , CONVERT(VARCHAR(10),DatePlaced, 112) 
having count(1) > 1 
order by DatePlaced desc 

Answer 1

请尝试以下查询

select ReferenceNumber, PremiseId , CONVERT(VARCHAR(10),DatePlaced, 112) as 
DatePlaced,count(1) as cnt 
from [ypolive_Integration].[dbo].[OrderHeaders] 
group by ReferenceNumber, PremiseId , CONVERT(VARCHAR(10),DatePlaced, 112) 
having count(1) > 1 

Answer 2

可以如下查询：

Select * from (
    SELECT --ReferenceNumber, PremiseId, DatePlaced, 
      * 
      ,RowN = Row_Number() over (partition by ReferenceNumber, PremiseId order by DatePlaced desc) 
    FROM [ypolive_Integration].[dbo].[OrderHeaders] 
) a 
Where a.RowN > 1 

Answer 3

尝试使用此查询：

SELECT ReferenceNumber, PremiseId, DatePlaced 
FROM [ypolive_Integration].[dbo].[OrderHeaders] 
WHERE ReferenceNumber in 
(SELECT ReferenceNumber FROM [ypolive_Integration].[dbo].[OrderHeaders] 
GROUP BY ReferenceNumber HAVING COUNT(*)>1) 
AND PremiseId in (SELECT PremiseId FROM [ypolive_Integration].[dbo].[OrderHeaders] GROUP BY PremiseId HAVING COUNT(*)>1) 
AND DatePlaced in (SELECT DatePlaced FROM [ypolive_Integration].[dbo].[OrderHeaders] GROUP BY DatePlaced HAVING COUNT(*)>1) 

Answer 4

WITH [Select_Dups] AS(
SELECT [RN] = ROW_NUMBER() OVER (PARTITION BY [ReferenceNumber], [PremiseId], [DatePlaced] ORDER BY [ReferenceNumber]), 
[ReferenceNumber], [PremiseId], [DatePlaced] 
FROM [ypolive_Integration].[dbo].[OrderHeaders] 
) 
SELECT [ReferenceNumber], [PremiseId], [DatePlaced] 
FROM [Select_Dups] 
WHERE [RN] > 1 

或类似的，如果你只是日期（没有时间）后：

WITH [Select_Dups] AS(
SELECT [RN] = ROW_NUMBER() OVER (PARTITION BY [ReferenceNumber], [PremiseId], CAST([DatePlaced] as date) ORDER BY [ReferenceNumber]), 
[ReferenceNumber], [PremiseId], [Date] = CAST([DatePlaced] as date) 
FROM [ypolive_Integration].[dbo].[OrderHeaders] 
) 
SELECT [ReferenceNumber], [PremiseId], [Date] 
FROM [Select_Dups] 
WHERE [RN] > 1 

Answer 5

SELECT ReferenceNumber 
    ,PremiseId 
    ,DatePlaced 
    ,convert(VARCHAR(100), ReferenceNumber) + ' - ' + convert(VARCHAR(100), PremiseId) + ' - ' + convert(VARCHAR(100), DatePlaced, 121) combined --Remove this line if not needed 
FROM [ypolive_Integration].[dbo].[OrderHeaders] 
WHERE convert(VARCHAR(100), ReferenceNumber) + ' - ' + convert(VARCHAR(100), PremiseId) + ' - ' + convert(VARCHAR(100), DatePlaced, 121) IN (
     SELECT convert(VARCHAR(100), ReferenceNumber) + ' - ' + convert(VARCHAR(100), PremiseId) + ' - ' + convert(VARCHAR(100), DatePlaced, 121) combined 
     GROUP BY convert(VARCHAR(100), ReferenceNumber) + ' - ' + convert(VARCHAR(100), PremiseId) + ' - ' + convert(VARCHAR(100), DatePlaced, 121) 
     HAVING COUNT(*) > 1 
     ) 
ORDER BY DatePlaced DESC