oracle 中 GROUP BY 必须跟select中用到的所有字段?
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where a.id = b.id
and a.history = b.history;
select * from (select t.*,row_number() over(partition by id order by history desc) rn from tablename t) where rn = 1
select * from tablename s where rowid in (select max(rowid) from tablename group by id)
select a.* from tablename a,(select id,max(history)as history2 from tablename group by id) b
where a.id = b.id
and a.history = b.history2
and rownum <= 2
from tablename
group by id