Mysql case when 語句不兼容only_full_group_by問題解決記錄

問題背景：

 

項目執行 case when + group by 的語句

運行報錯：[2018-12-26 17:50:15] [42000][1055] Expression #3 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'paydata.edu_syn_hd_ded.CUTTYPE' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by   

解決：

先查詢sqlmode，嘗試在DataGrip中運行SQL語句，如下

use paydata 

set sql_mode = 'STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION'

但是隻在DataGrip環境中生效，通過mybatis還是報錯。

需修改數據庫服務器配置文件：/etc/my.cnf

添加：

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

保存，重啓mysql服務後生效。

tips：

重啓數據庫服務後，再連接報錯Public Key Retrieval is not allowed

連接url後加參數：allowPublicKeyRetrieval=true