mysql鎴栬€卭racle鍒嗙粍鎺掑簭鍙栧墠鍑犳潯鏁版嵁

Posted 2020-11-18

鏍囩锛?a href='http://www.mamicode.com/so/1/mysq' title='mysq'>mysq   mysql   where   鍒嗙粍   row   鏁版嵁   des   sel   ora   

mysql:

select a.*
from
(
select t1.*,(select count(*)+1 from 琛?where 鍒嗙粍瀛楁=t1.鍒嗙粍瀛楁 and 鎺掑簭瀛楁<t1.鎺掑簭瀛楁) as group_id
from 琛?t1
) a
where a.group_id<=3

 

Oracle锛?/p>

SELECT t.*         
   FROM (SELECT ROW_NUMBER() OVER(PARTITION BY 鍒嗙粍瀛楁 ORDER BY 鎺掑簭瀛楁 DESC) rn,         
         b.*         
         FROM 琛?b) t         
  WHERE t.rn <= 3  ;