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中執行包含 group by 命令的語句時，報錯如下：

[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

• 報錯的原因：

  • MySQL 5.7.5及以上功能依賴檢測功能。如果啟用了ONLY_FULL_GROUP_BY SQL模式（預設情況下），MySQL將拒絕選擇列表，HAVING條件或ORDER BY列表的查詢引用在GROUP BY子句中既未命名的非集合列，也不在功能上依賴於它們

• 解決方法就是修改sql-mode ，sql-mode是對sql語法支援的限制，具體過程如下：

  • 在MySql命令列介面鍵入以下命令：

  select @@global.sql_mode;
  

  • 查詢出來的結果如下：

  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
  

  • 我們需要去掉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’;
  

  • 然後重啟一下MySql，問題解決～