mysql解决1055-Expression#22ofSELECT list is not in GROUP BY clause and contains nonaggregated column ‘

问题：
在mysql5.7以上的版本中，对于 group by 的这种聚合操作，如果在select 中的列，没有在group by 中出现，那么这个SQL是不合法的，因为列不在group by的从句中，所以对于设置了这个mode的数据库，only_full_group_by：使用这个就是使用和oracle一样的group 规则, select的列都要在group中,或者本身是聚合列(SUM,AVG,MAX,MIN) 才行。
使用 SQL 语句可以查询这个配置

SELECT @@sql_mode;

解决方案：
方案1.运行sql，每次重启电脑后都需要重写运行

SET GLOBAL sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION';

方案2.如果是Linux，就在配置文件（my.cnf）中修改 sql_mode 的配置（在/usr/local/etc/my.cnf路径下）。如果是Windows，就修改配置文件my.ini文件，添加如下：

sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION';

重启mysql：

service mysqld restart

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