HQL 子查询替换

Question

如何在 HQL 中替换此子查询（因为 HQL 不支持子查询）：

SELECT l.aUser, count(l.aUser) 
FROM LifeTable l 
WHERE l.aUser IS NOT NULL
GROUP BY l.aUser 
HAVING count(l.aUser) = 
(SELECT min(cnt) 
 FROM (SELECT count(l.aUser) cnt 
       FROM LifeTable l 
       WHERE l.aUser IS NOT NULL 
       GROUP BY l.aUser) a)

此查询应该select LifeTable 中出现次数最少的用户。谢谢！

Answer 1

我想你可以使用 all:

SELECT l.aUser, count(l.aUser) 
FROM LifeTable l 
WHERE l.aUser IS NOT NULL
GROUP BY l.aUser 
HAVING COUNT(*) <= ALL (SELECT count(*) as cnt 
                        FROM LifeTable l2 
                        WHERE l2.aUser IS NOT NULL AND
                              l2.aUser = l.aUser
                       );

还有一点点正确。 HQL 确实支持子查询，只是不在 FROM 子句中。

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