将排序规则添加到 SQL Server CTE 语句

Question

我正在尝试确定如何将 COLLATION 添加到此操作中......

WITH CTE (srtTxt, DuplicateCount)
AS
(
    SELECT 
       srtTxt,
       ROW_NUMBER() OVER(PARTITION BY srtTxt ORDER BY ID) AS DuplicateCount
    FROM dbo.tblLang
    **WHERE DuplicateCount > 1**
 )
 DELETE
 FROM CTE
 WHERE DuplicateCount > 1
 GO

这是我正在尝试应用的设置...

COLLATE Latin1_General_CS_AS srtTxt 

我已经尝试过各种这样的改变......

WITH CTE (srtTxt, DuplicateCount)
AS
(
    SELECT 
       srtTxt,
       ROW_NUMBER() OVER(PARTITION BY srtTxt ORDER BY ID) AS DuplicateCount
    FROM 
       (SELECT srtTxt COLLATE Latin1_General_CS_AS AS srtTxt
        FROM dbo.tblLang) AS T
       **WHERE DuplicateCount > 1**
 )
 DELETE
 FROM CTE
 WHERE DuplicateCount > 1
 GO  

关于如何实现这一点的任何想法？

Answer 1

我看到您错过了在子查询中选择 ID 请按如下方式添加ID

;WITH CTE (srtTxt, DuplicateCount)
AS (
    SELECT 
    srtTxt,
    ROW_NUMBER() OVER(PARTITION BY srtTxt ORDER BY ID) AS DuplicateCount
    FROM (
    SELECT 
    ID, srtTxt COLLATE Latin1_General_CS_AS AS srtTxt
    FROM dbo.tblLang
    ) AS T
 )
 DELETE
 FROM CTE
 WHERE DuplicateCount > 1
 GO  

Answer 2

鉴于您正在删除，您不需要选择除分区以外的srtTxt，所以只需要：

WITH CTE
AS
(
    SELECT 
       ROW_NUMBER() OVER(PARTITION BY srtTxt COLLATE Latin1_General_CS_AS 
                         ORDER BY ID) AS DuplicateCount
    FROM dbo.tblLang
 )
 DELETE
 FROM CTE
 WHERE DuplicateCount > 1; 

但是，如果您确实还需要选择重新整理的字段，为了防止在Select 和分区中重复整理，您可以使用前面的 CTE 将其干燥：

WITH Collated AS 
( 
   SELECT ID, srtTxt COLLATE Latin1_General_CS_AS srtTxt
   FROM dbo.tblLang
),
Duplicates(srtTxt, DuplicateCount)
 AS
 (
    SELECT srtTxt,
    ROW_NUMBER() OVER(PARTITION BY srtTxt ORDER BY ID) AS DuplicateCount
    FROM Collated
 )
 DELETE
 FROM Duplicates
 WHERE DuplicateCount > 1; 

Fiddle