原解决升级到Mysql5.7后，遇到的group by 查询问题
升级到mysql 5.7后，但进行一些group by 查询时，比如下面的
SELECT *, count(id) as count FROM `news` GROUP BY `group_id` ORDER BY `inputtime` DESC LIMIT 20
就会报如下错误：
SELECT list is not in GROUP BY clause and contains nonaggregated column 'news.id' which is not functionally dependent on …
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