[英]SQL selecting specific DISTINCT rows
试试看:
SELECT [EVENT]
,MAX([Value])
FROM [MyTable]
GROUP BY [EVENT]
最简单的方法是使用子查询或row_number()
:
select event, value
from (select t.*, row_number() over (partition by event order by value desc) as seqnum
from mytable t
) t
where seqnum = 1;
要么:
select t.*
from mytable t
where t.value = (select max(t2.value) from mytable t2 where t2.event = t.event);
您应谨慎命名列。 在某些数据库中, event
和value
可能是保留字。
SELECT [EVENT], MAX([Value]) FROM [My Table] GROUP BY [EVENT]
怎么样?
您在正确的轨道上。
select event, max(value) from test group by event
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