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今天由mysql 5.6升級到5.7的時候，遇到一個group by的錯誤：
Expression #2 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column ‘trade.create_time’ which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
原來，執行下面語句發現，默認的sql_mode修改了，變成：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，而5.6版默認是：NO_ENGINE_SUBSTITUTION

1	show VARIABLES like 'sql_mode';

沒辦法，需要去掉ONLY_FULL_GROUP_BY，則執行

setglobalsql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';

轉載于:https://my.oschina.net/u/3670641/blog/1529099

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