mysql5.7執行sql語句報錯:In aggregated query without GROUP BY, expression #1 of SELECT list contains nonagg...

mysql5.7執行sql語句報錯:In aggregated query without GROUP BY, expression #1 of SELECT list contains nonaggregated column 'yunva_changke.u.user_id'; this is incompatible with sql_mode=only_full_group_by 1.方法
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