hql语句的from不支持子查询，where支持

hql语句的from不支持子查询，where支持！
   如： select a from A a,(select b from B b,C c where b.id=c.id) d
       where a.id=d.id;
  改为→select a from A a where a.id in (select b.id from B b,C c
       where b.id=c.id);