解决[Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause 的问题 MySQL
参考文章：
（1）解决[Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause 的问题 MySQL
（2）https://www.cnblogs.com/xpx951201/p/11208978.html
备忘一下。
来源：oschina
链接：https://my.oschina.net/u/4428122/blog/4750180