mysql 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column
1。问题描述：
新安装得mysql 执行代码时出意异常：
1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column ‘information_schema.PROFILING.SEQ‘ which is not functionally dependent on columns in GROUP BY clause; this is incompatible
with sql_mode=only_full_group_by
2.原因分析：MySQL 5.7.5及以上功能依赖检测功能。如果启用了ONLY_FULL_GROUP_BY SQL模式（默认情况下），MySQL将拒绝选择列表，HAVING条件或ORDER BY列表的查询引用在GROUP BY子句中既未命名的非集合列，也不在功能上依赖于它们。
MySQL5.7.5之下没有检测到功能依赖关系，默认情况下不启用ONLY_FULL_GROUP_BY。
3.解决方案：
临时性解决方案：
执行：set sql_mode =(select replace(@@sql_mode,'ONLY_FULL_GROUP_BY',''));
永久性解决方案：
查找mysql配置文件位置：find / -name my.cnf
添加配置项：”sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION“ 到配置文件
重启MySQL：systemctl restart mysqld.service
