Mysql解决SELECT list is not in GROUP BY clause and contains nonaggregated column 问题

在使用GROUP BY对Mysql的数据表进行查询时若是出现如下错误mysql select * from user group by age; ERROR 1055 (42000): Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'test.user.user_i
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