删除MSSQL中的重复项

Question

在MSSQL表中我有3列。我有多个KeptValue s重复。我需要删除所有重复项并保留1.但是我需要保留花费最多的那个。
我创建了2个视图。重复保存的值列表VW_DUPLICATE1。

Answer 1

您可以通过废

Answer 2

delete t1 
from your_table t1 
left join 
(
    select keptvalue, max(spent) as mSpent 
    from your_table 
    group by keptvalue 

) t2 on t1.keptvalue = t2.keptvalue and t1.spent = t2.mSpent 
where t2.mSpent is null 

Answer 3

您可以使用此查询的具体KepValue删除保持最高SPENT做group by KeptValue和max合计实现这一目标。

DELETE FROM your_table WHERE SPENT < (SELECT MAX(SPENT) FROM your_table WHERE KeptValue='your_value') AND KeptValue='your_value' 

Answer 4

试试这个

DELETE FROM tbl WHERE Id IN (
    SELECT Id FROM (
     SELECT 
      Id 
      ,ROW_NUMBER() OVER (PARTITION BY KeptValue ORDER BY SPENT DESC) AS [ItemNumber] 
     FROM 
      tbl 
    ) a WHERE ItemNumber > 1 
) 

Answer 5

试试这个

Create table #temp (ID int, KeptValue NVARCHAR(20) , SPENT numeric(18,3)) 

INSERT INTO #temp select 1,'KeptValue1', 20 
INSERT INTO #temp select 2,'KeptValue1', 21 
INSERT INTO #temp select 3,'KeptValue2', 22 
INSERT INTO #temp select 4,'KeptValue2', 20 
INSERT INTO #temp select 5,'KeptValue2', 20 
INSERT INTO #temp select 6,'KeptValue3', 20 
INSERT INTO #temp select 7,'KeptValue3', 23 
INSERT INTO #temp select 8,'KeptValue3', 24 
INSERT INTO #temp select 9,'KeptValue4', 28 
INSERT INTO #temp select 10,'KeptValue4', 23 
INSERT INTO #temp select 11,'KeptValue5', 24 
INSERT INTO #temp select 12,'KeptValue6', 28 

select * FROM #temp 

DELETE 
FROM #temp 
WHERE ID 
in(
    select ID from 
        (SELECT Id, (ROW_NUMBER() OVER(PARTITION BY KeptValue order by SPENT desc)) as R 
        from #temp 
        ) as RowsNm 
    WHERE R >1) 

select * from #temp 


drop table #temp