https://bbs.fanruan.com/thread-133002-1-1.html
https://www.cnblogs.com/cai170221/p/11357997.html
https://www.cnblogs.com/yasuo2/p/6433697.html 参考 FOR XML PATH 函数用法
https://blog.csdn.net/shijie_nihao/article/details/100620921