目錄：

　　錯誤信息

　　原因分析

　　解決方案

　　操作示例

• 錯誤信息

  [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
  
• 原因分析
  Mysql 中的SQL 語法並是嚴格按照SQL 95 標準的。在聚合操作時，group by 允許不包含所有select的非聚合 列. mysql 提供了一個參數可以使SQL 嚴格按照SQL 95標準編寫，但是同時此參數是存在缺陷的。一些delete 等非聚合操作，從java 客戶端發起時，有可能會引起錯誤：[err] 1055.

• 解決方案
  簡單的解決方案就是取消此參數設置。參數的設置方法如下:
  

  # 臨時調整
  set @@sql_mode=‘參數列表,以逗號分隔‘
  或者
  set global sql_mode=‘參數列表,以逗號分隔‘
  # 永久調整  修改參數配置文件my.cnf
  sql_mode = ‘參數列表，不同參數之間以逗號分隔‘
  
• 示例
  
  • 臨時修改示例

    mysql> 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‘;
    Query OK, 0 rows affected (0.00 sec)
    mysql> exit
    Bye
    [root@test ~]# mysql -D
    Reading table information for completion of table and column names
    You can turn off this feature to get a quicker startup with -A
    
    Welcome to the MySQL monitor.  Commands end with ; or \g.
    Your MySQL connection id is 1814164
    Server version: 5.7.17 MySQL Community Server (GPL)
    
    Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
    
    Oracle is a registered trademark of Oracle Corporation and/or its
    affiliates. Other names may be trademarks of their respective
    owners.
    
    Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.
    
    mysql> select @@sql_mode;
    +------------------------------------------------------------------------------------------------------------------------+
    | @@sql_mode                                                                                                             |
    +------------------------------------------------------------------------------------------------------------------------+
    | STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION |
    +------------------------------------------------------------------------------------------------------------------------+
    1 row in set (0.00 sec)
    
  • 永久修改示例
    

    # 修改之前
    sql_mode=‘ONLY_FULL_GROUP_BY,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION‘
    # 修改之後
    sql_mode=‘NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION‘
    

Mysql err 1055