hibernate - HQL 结合聚合函数

Question

我的问题是我不能像在查询中那样一起使用这两个聚合函数： AVG(MIN(, 首​​先我需要从该实体 termResultCurrent 获取最小值，然后是所有最小值的平均值。可能必须更改它group by 并包含一些其他子句来获取最小值（我不知道这是否可能）。否则，它可能正在使用子查询，但我对 group by 有问题......我知道这很有挑战性但我很感激你的帮助。

SELECT  AVG(MIN(termResultCurrent.position)), count(*)
FROM TermSubscription subscription,
     Competitor competitor,     
     TermQuery termQueryPrev, IN(termQueryPrev.results) termResultPrev,     
     TermQuery termQueryCurrent,IN(termQueryCurrent.results) termResultCurrent     
 WHERE subscription.account.id= 274
      and competitor.id = 379 
      AND termQueryPrev.term=subscription.term      
      AND termQueryCurrent.term=subscription.term       
      AND termQueryCurrent.provider.id= 1  
      AND termQueryCurrent.provider.id=termQueryPrev.provider.id       
      AND termQueryPrev.queryDate.yearWeek = YEARWEEK(FROM_DAYS(TO_DAYS('2013-01-01') - 7), 1)       
      AND termQueryCurrent.queryDate.yearWeek = YEARWEEK('2013-01-01',1)      
      AND termResultPrev.url.hostname   MEMBER competitor.domains       
      AND termResultCurrent.url.hostname   MEMBER competitor.domains  
 group by  subscription.term.id

Answer 1

用这个：

 select avg(s.minimum) from
    (SELECT MIN(termResultCurrent.position) minimum
        FROM TermSubscription subscription, ...
        WHERE subscription.account.id= 274 and ...  
        group by  subscription.term.id
    ) s;