休眠标准通过结合表

Question

不同我有一个表A中，除其他具有表B 的外键的字段我想获取（标准API优选的，HQL行太）的甲 X条目有独特的B参考，

任何想法？

Answer 1

FROM A AS a 
WHERE a.b IN (SELECT ax.b 
       FROM A AS ax 
       GROUP BY b HAVING COUNT(b) = 1)