mysql根据单个值剔除重复数据

DELETE FROM dashboard_issues WHERE id NOT IN (SELECT temp.min_id FROM (SELECT MAX(id) min_id FROM dashboard_issues GROUP BY code )AS temp);

把数据库:test(数据库)->test(数据表)->key(字段)设置unique 索引为例:

alter table test add unique index (`key`);  //创建unique索引

alter table test drop index `key`; //删除key键 unique索引



作者:willeny
链接:https://www.jianshu.com/p/89e620c0f246
来源:简书
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原文地址:https://www.cnblogs.com/slqt/p/10912309.html