select u from UserGroup ug inner join ug.user u where ug.group_id = :groupId order by u.lastname
作为命名查询：
@NamedQuery(
name = "User.findByGroupId",
query =
"SELECT u FROM UserGroup ug " +
"INNER JOIN ug.user u WHERE ug.group_id = :groupId ORDER BY u.lastname"
)
使用HQL语句中从一个实体到另一个实体的路径。有关详细信息，请参见有关HQL和连接的Hibernate文档。
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