蜂巢：使用選擇內選擇

Question

首先，我使用的查詢：

select name 
from tab1 
where id in (select id 
      from (select id,count(id) as a 
        from tab2 
        group by id 
        order by a desc limit 1) ; 

，我才知道，裏面選擇選擇是不可能的蜂巢。 所以我用變量修改它。

set var1= select count(id) as a from tab2 group by id order by a desc limit 1; 

select name from tab1 group by name having count(id)='${hiveconf:var1}'; 

但在'${hiveconf:var1}'的地方，查詢得到取代的，並再次得到同樣的錯誤。

有沒有辦法做到這一點？

Answer 1

select t1.name 

from   tab1 t1 

     join (select  id 
          ,count(*) as cnt 
       from  tab2 
       group by id 
       order by cnt desc 
       limit  1 
       ) t2 

     on  t2.id = t1.id