在分組查詢時會遇到 sql語句報錯問題
#1055 - Expression #3 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'cash.sdb_login_log.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
MySQL 5.7.5後only_full_group_by成爲sql_mode的默認選項之一,這可能導致一些sql語句失效。
1、查看sql_mode
select @@sql_mode
查詢出來的值爲:
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
2、去掉ONLY_FULL_GROUP_BY,重新設置值。
set @@sql_mode ='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';
3、上面是改變了全局sql_mode,對於新建的數據庫有效。對於已存在的數據庫,則需要在對應的數據下執行:
set sql_mode ='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';
------------------------以上有遇到無效的情況!!
4、想要徹底解決這個問題 就得去改my.ini 配置(如果你們mysql 沒有這個文件,就把my-default.ini 改成my.ini)
在 [mysqld]下添加
sql_mode = STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
啓動數據庫後
sql_mode 就是我們設置的值