一对多就是宽依赖一对多就是宽依赖一对多就是宽依赖!!!!!!!!!!!!!!!!!
参考链接:https://blog.youkuaiyun.com/fortuna_i/article/details/81170565
https://blog.youkuaiyun.com/dream0352/article/details/62229977
一对多就是宽依赖一对多就是宽依赖一对多就是宽依赖!!!!!!!!!!!!!!!!!
参考链接:https://blog.youkuaiyun.com/fortuna_i/article/details/81170565
https://blog.youkuaiyun.com/dream0352/article/details/62229977