使用分区由SQL Server

Question

我需要从表中删除重复删除重复：

;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是主键。

我想知道如何只保留其中也有[specimen id]

Answer 1

通过向quicklabdumpid DESC更改为了最大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

无需多次出现的分区

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