安裝新本版的MySQL　GROUP BY分組查詢會出現錯誤提示如下：

[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

MySQL　5.7.X的預設的sql_model值為(進入MySQL輸入命令select @@global.sql_mode即可檢視)：

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

問題就出現在ONLY_FULL_GROUP_BY上，需要把該值去掉即可．
以Linux的MySQL 5.7.20為例說明修改方法：
開啟mysql配置檔案sudo vim /etc/mysql/mysql.conf.d/mysqld.cnf，然後在［mysqld］下新增如下一行：

sql_mode=STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,TRADITIONAL,NO_AUTO_CREATE_USER
 

預設配置中沒有sql_mode,自行新增此行，添加了此行配置就把ONLY_FULL_GROUP_BY預設的去掉了，儲存之後重啟MySQL即可（sudo service mysql restart）．

提示：如果進入MySQL命令列方式設定sql_model值，重啟Mysql就又恢復預設值了，屬於當前session範圍的．所以最好直接修改配置檔案，這樣就會永久有效．