删除表中具有相同值的重复行，但在 SQL Server 中保留一行

Question

这是我的存储过程中的查询之一，我将Main 表中的记录插入到重复表中，之后我想在我的主表中删除多个重复行。

这是我的代码

 IF EXISTS (SELECT * 
            FROM [JOB] 
            WHERE 
              AND ExternalSourceId = @ExternalSourceId 
              AND Id <> @Id 
              AND IsActive = 1)
 BEGIN
    INSERT INTO DupJob 
        SELECT * 
        FROM [JOB] j 
        WHERE 
          AND ExternalSourceId = @ExternalSourceId 
          AND Id <> @Id 
          AND IsActive = 1 
          AND NOT EXISTS (SELECT * FROM DupJob dj WHERE J.Id = dj.Id)     
    -- the delete should delete all duplicates except one ?
 END    

寻求帮助以继续，谢谢

Answer 1

row_number() 和 CTE 是一种方便的方法。我不确定你想要的逻辑到底是什么，但它是这样的：

with todelete as (
      select j.*,
             row_number() over (partition by OrganizationName, JobTitle, PostalCode, ExternalSourceId)
                                order by id) as seqnum
      from job j
     )
delete from todelete
    where seqnum > 1;

这将在partition by 中的每一列中保留一行，即最小值为id 的那一行。