mysql 多层次查询，属性结构数据查询https://blog.csdn.net/xiaoweite1/article/details/103105002?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.edu_weight&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.edu_weight版权声明：本文为zhaomengxia123原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接和本声明。原文链接：https://blog.csdn.net/zhaomengxia123/article/details/108273511