[英]SELECT MAX() of Column, DATE Column and group by ID
我想從每個AssetId的表格中選擇MAX()設施等級狀態,但也要獲取關聯的日期。
我可以獲取每個assetID的最高級別,但是由於我是按AssetID分組的,因此無法弄清楚如何攜帶關聯的日期,但是該日期是唯一的。
DROP TABLE #temp
CREATE TABLE #temp
(AssetId int, FacilityStatusLevel int, DateProcessed date)
INSERT INTO #temp(AssetId, FacilityStatusLevel, DateProcessed)
VALUES
(1, 1,'2019-01-01'),
(1, 2,'2019-01-02'),
(2, 3,'2019-01-03'),
(2, 4,'2019-01-04'),
(3, 5,'2019-01-05')
SELECT AssetID, MAX(#temp.FacilityStatusLevel) as MaxFacilityStatusLevel
FROM #temp
GROUP BY AssetID
我希望輸出如下:
AssetID | MaxFacilityStatusLevel | DateProcessed
1 2 2019-01-02
2 4 2019-01-04
3 5 2019-01-05
有不存在:
SELECT t.* FROM #temp t
WHERE NOT EXISTS (
SELECT 1 FROM #temp
WHERE AssetID = t.AssetID AND FacilityStatusLevel > t.FacilityStatusLevel
)
參見演示 。
結果:
AssetId | FacilityStatusLevel | DateProcessed
------: | ------------------: | :------------
1 | 2 | 02/01/2019
2 | 4 | 04/01/2019
3 | 5 | 05/01/2019
您可以使用相關子查詢:
select t.*
from #temp t
where t.FacilityStatusLevel = (select max(t2.FacilityStatusLevel) from #temp t2 where t2.assetid = t.assetid);
您可以使用MAX ([ ALL ] expression) OVER ( [ <partition_by_clause> ] [ <order_by_clause> ] )
編寫查詢,如下所示:
Select
AssetId,
MaxFacilityStatusLevel,
DateProcessed
from
(
select AssetId ,
max(FacilityStatusLevel) over (partition by AssetId ) as
MaxFacilityStatusLevel,
row_number() over (partition by AssetId order by FacilityStatusLevel desc ) as
rownum,
DateProcessed
from #temp
) T
where T.rownum = 1
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