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自己解决了，
这个是错误的，路径有问题
建议再看看相关书籍，认真读读定义
再查询一些SQL调优的知识，学习一下
助你进阶架构
left join不就行了。
因为你写错了，你写这 玩意儿能查全部？两表关联查询不是这样写的