使用分區由SQL Server

Question

我需要從表中刪除重複刪除重複：

;WITH cte as(
SELECT ROW_NUMBER() OVER (PARTITION BY [specimen id] 
             ORDER BY (SELECT 0)) RN 
     FROM quicklabdump) 
     delete from cte where RN>1 

列quicklabdumpID是主鍵。

我想知道如何只保留其中也有[specimen id]

Answer 1

通過向quicklabdumpid DESC更改爲了最大quicklabdumpID。

WITH cte as(
    SELECT ROW_NUMBER() OVER (PARTITION BY [specimen id] 
          ORDER BY quicklabdumpid DESC) RN 
    FROM quicklabdump) 
delete from cte where RN>1 

Answer 2

無需多次出現的分區

delete q 
    from quicklabdump q 
    where exists 
    (
    select * 
     from quicklabdump q2 
     where q2.[specimen id] = q.[specimen id] and 
     q2.quicklabdumpID > q.quicklabdumpID 
)