mysql update select 从查询结果中更新数据

# update select 语句(注意:必须使用inner join) # 语法 update a inner join (select yy from b) c on a.id =c.id set a.xx = c.yy #SELECT knowledge_id,COUNT(0) nums FROM pro_base_timu_knowledge GROUP BY knowledge_id;

>>阅读原文<<