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

本文轉載自   查看原文   2019-12-23 17:05   7197    Mysql數據庫

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

運行上述查詢時，彈出一下錯誤

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
> 時間: 0.001s

經過查詢資料和測試，當mysql的sql_mode是only_full_group_by的時候，在不使用group by 並且select后面出現聚集函數的話，那么所有被select的都應該是聚集函數，否則就會報錯


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