mysql执行开窗函数，实现rank_ower()

select sku_id,sku_name,first_cate_id,second_cate_id,cate_id,id_level,group_price,sales,amt,rank from (  
  select sku_id,sku_name,first_cate_id,second_cate_id,cate_id,id_level,group_price,sales,amt,@rownum:=@rownum+1 ,  
  if(@sec=_tmp.second_cate_id,@rank:=@rank+1,@rank:=1) as rank,  
  @sec:=_tmp.second_cate_id
  from (   
  select sku_id,sku_name,first_cate_id,second_cate_id,cate_id,id_level,group_price,sales,amt from pdd_product_3 order by second_cate_id asc ,amt desc   
  ) _tmp , 
  (select @rownum :=0 , @sec := null ,@rank:=0) a  
) result
WHERE rank <= 10

 

没有用到rownum 可以不设置