mysql5.7 group by语法 1055
1055 - Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'information_schema.ENGINES.ENGINE' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
先来看如下语句，查询默认存在的引擎表
之前使用的MySQL版本为5.7以下，根据support进行分组执行语句如下
添加跟分组support无关的字段engine
没有任何问题
现在使用的版本是5.7
之后根据support进行分组之后
1055 - Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'information_schema.ENGINES.ENGINE' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
意思是
SELECT list不在GROUP BY子句中，并且包含非聚合列'information_schema. engine。在功能上不依赖于GROUP BY子句中的列;这与sql_mode=only_full_group_by不兼容
也就是select展示的列必须跟group by相关
这就跟oracle的group by语法一致了，不得不说，更合理些，当然了，一些查看语句应该就会复杂些
查看系统变量sql.mode
ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
修改方式，window编辑my.ini，Linux编辑my.cnf，将[mysqld]中的sql_mode的值删除ONLY_FULL_GROUP_BY，重启解决！
