休眠到很多反向查询

Question

我有2个实体Question和Answer之间的many2one关系与Answer' and no one2many defined in Question`中定义的many2one。

如何在冬眠时查询没有任何答案的问题，而无需在Question实体中添加one2many关系？

类似：

select distinct q from Question q 
left join Answer a on a.question_id=q.id 
where a.id is null 

Answer 1

事情是这样的：

select q from Question q 
where q not in (select a.question from Answer a) 

顺便说一句，你提供的查询是 “太多SQL”，请记住，虽然它们的语法很相似，SQL和JPQL是概念不同。