mysql5.6升級mysql5.7語法問題

1.升級后，原sql語句執行報錯

mysql> select log_server,log_user,f6,tx1,log_time from log_exception where log_time between "2020-03-01 00:00:00" and "2020-03-10 23:59:59" AND 0=0 group by tx1 ORDER BY log_time DESC limit 0,50;
ERROR 1055 (42000): Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'beans_zombie.log_exception.log_server' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

2.查看sql_mode參數：

mysql> SELECT @@sql_mode;

 

 報錯原因：對於group by聚合操作,如果在select中的列沒有在group by中出現,那么這個SQL是不合法的,因為列不在group by從句中,所以設置了sql_mode=only_full_group_by的數據庫,在使用group by時就會報錯

3.解決方法：去掉ONLY_FULL_GROUP_BY參數

修改my.cnf文件，在[mysqld]配置內添加參數，重啟mysql

sql_mode = STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

或者

使用的是騰訊雲實例，可以直接在控制台在線修改參數

 

4.重新連接mysql回話生效