SELECT list is not in GROUP BY clause and contains nonaggregated column this is incompatible with sql_mode=only_full_group_by
2017-07-17 11:02
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使用 select @@sql_mode； 命令可以看到，数据库设置了 ONLY_FULL_GROUP_BY 的mode，意思就是：
对于GROUP BY聚合操作，如果在SELECT中的列，没有在GROUP BY中出现，那么这个SQL是不合法的，因为列不在GROUP BY从句中
所以对于设置了这个mode的数据库，在使用group by 的时候，就要用MAX(),SUM(),ANT_VALUE()这种聚合函数，才能完成GROUP BY 的聚合 操作。
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对于GROUP BY聚合操作，如果在SELECT中的列，没有在GROUP BY中出现，那么这个SQL是不合法的，因为列不在GROUP BY从句中
所以对于设置了这个mode的数据库，在使用group by 的时候，就要用MAX(),SUM(),ANT_VALUE()这种聚合函数，才能完成GROUP BY 的聚合 操作。
执行
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