MySql遇到 [Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggr

MySql遇到 [Err] 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

• 在MySql中执行包含 group by 命令的语句时，报错如下：

[Err] 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

• 报错的原因：

  • 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

• 解决方法就是修改sql-mode ，sql-mode是对sql语法支持的限制，具体过程如下：

  • 在MySql命令行界面键入以下命令：

  select @@global.sql_mode;
  

  • 查询出来的结果如下：

  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
  

  • 我们需要去掉ONLY_FULL_GROUP_BY，直接重置sql_mode的值，如下：

  set @@global.sql_mode=’STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION’;
  

  • 然后重启一下MySql，问题解决～