[英]How to get max value and corresponding date in SQL Server
我有一张位置、日期和海拔值的表格。 下面的查询很简单,但我试图获取与高度的最小/最大值相对应的最小/最大日期。
SELECT location,
max(datetime) as max_date
COUNT(Altitude) as COUNT,
AVG(Altitude) as AVG,
MIN(Altitude) as MIN,
max(Altitude) as MAX
FROM mydatabase
GROUP BY location
对于每个位置 select 最大和最小高度以及它们的最大最小日期时间。
select location, Altitude, min([datetime]) dtmin, max([datetime]) dtmax
from (
SELECT location, Altitude, [datetime]
, min(Altitude) over(partition by location) as aMIN
, max(Altitude) over(partition by location) as aMAX
FROM mydatabase
) t
where Altitude in (aMIN, aMAX)
group by location, Altitude
order by location, Altitude;
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