MySQL升级到5.7.16 遇到的第一个问题"[Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and"

升级之后马上体验了一下，执行“UPDATE user_course SET userid = 200 WHERE id = 28;”，结果报[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 这个错误，语句虽然执行成功了，但是出现这个错误，心里也是慌慌的。

于是百度了一下这个错误的解决办法：

SHOW VARIABLES LIKE '%sql_mode%';  查看下SQL的模式，结果是发现了 

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。 的确是存在 ONLY_FULL_GROUP_BY.

 

那就修改sql_mode的值

set sql_mode = '';
set sql_mode = 'NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES';

 

再次执行刚才的语句，就不会报错了。