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MySql 错误：In aggregated query without GROUP BY, expression #1 of SELECT list contains....

本文转载自  查看原文  2019-12-23 17:05  7197    Mysql数据库

select c_no,AVG(sc_degree) from score where s_no IN (select s_no from student where s_class = '95031');

运行上述查询时，弹出一下错误

select c_no,AVG(sc_degree) from score where s_no IN (select s_no from student where s_class = '95031')
> 1140 - In aggregated query without GROUP BY, expression #1 of SELECT list contains nonaggregated column 'school_test.score.c_no'; this is incompatible with sql_mode=only_full_group_by
> 时间: 0.001s

经过查询资料和测试，当mysql的sql_mode是only_full_group_by的时候，在不使用group by 并且select后面出现聚集函数的话，那么所有被select的都应该是聚集函数，否则就会报错


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