mysql使用group by查询报错SELECT list is not in GROUP BY clause and contains nonaggregated column

回答: 当使用GROUP BY语句进行查询时，SELECT语句中只能包含GROUP BY后面声明的列或者聚合函数。这是因为MySQL的ONLY_FULL_GROUP_BY模式要求SELECT语句中的列必须是明确的，以确保分组求最值的合法性检查。这种模式采用了与Oracle、DB2等数据库的处理方式。因此，如果在GROUP BY语句中使用了聚合函数，就需要将SELECT语句中的列限制在GROUP BY后面声明的列或者聚合函数中。如果SELECT语句中出现了不明确的列，就会报错"SELECT list is not in GROUP BY clause and contains nonaggregated column"。\[1\]\[2\]\[3\]
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