标签：联合主键 logs 主键 net lan nbsp blank http topic
https://www.cnblogs.com/chenjfblog/p/7593509.html
https://bbs.csdn.net/topics/391814929?page=1
【编程】创建联合主键及通过联合主键查询
原文地址：https://www.cnblogs.com/Mars-0603/p/14371103.html
