👀forward：上面那个放进SQL有点问题，下面这一段可以跑出来： select p1.月份,p1.seller_name from (  select '2019M5' as 月份, seller_name,sum(gmv) as sum   from purchase   where month(dt)=5   group by seller_name   order by sum   limit 50)  p1 union select p2.月份,p2.eller_name from (  select '2019M6' as 月份, seller_name,sum(gmv) as sum   from purchase   where month(dt)=6  group by seller_name   order by sum   limit 50)  p2;