如何用HQL或JPQL编写？

Question

嗨，我是新的JPA和Hibernate概念。任何人都可以帮我写我所请求查询的HQL或JPQL。

例如：

select count(*) from (select count(u.email) from USER u where u.id='123' group by u.email having count(u.email) > 1);