发布于 2016-04-07 21:26:42 | 66 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的Mysql教程,程序狗速度看过来!

Mysql关系型数据库管理系统

MySQL是一个开放源码的小型关联式数据库管理系统,开发者为瑞典MySQL AB公司。MySQL被广泛地应用在Internet上的中小型网站中。由于其体积小、速度快、总体拥有成本低,尤其是开放源码这一特点,许多中小型网站为了降低网站总体拥有成本而选择了MySQL作为网站数据库。


在实际项目中,我们经常会遇到删除数据库中重复数据的问题,貌似是很简单的问题哈,下面我们来探讨下

刚开始,根据我的想法,这个很简单嘛,上sql语句


delete from zqzrdp where tel in (select min(dpxx_id) from zqzrdp group by tel having count(tel)>1);

执行,报错!!~!~

异常意为:你不能指定目标表的更新在FROM子句。傻了,MySQL 这样写,不行,让人郁闷。

难倒只能分步操作,蛋疼

以下是网友写的,同样是坑爹的代码,我机器上运行不了。

1. 查询需要删除的记录,会保留一条记录。


select a.id,a.subject,a.RECEIVER from test1 a left join (select c.subject,c.RECEIVER ,max(c.id) as bid from test1 c where status=0 GROUP BY RECEIVER,SUBJECT having count(1) >1) b on a.id< b.bid where a.subject=b.subject and a.RECEIVER = b.RECEIVER and a.id < b.bid

2. 删除重复记录,只保留一条记录。注意,subject,RECEIVER 要索引,否则会很慢的。


delete a from test1 a, (select c.subject,c.RECEIVER ,max(c.id) as bid from test1 c where status=0 GROUP BY RECEIVER,SUBJECT having count(1) >1) b where a.subject=b.subject and a.RECEIVER = b.RECEIVER and a.id < b.bid;

3. 查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断


select * from people where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1)

4. 删除表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断,只留有rowid最小的记录


delete from people where peopleId in (select peopleId from people group by peopleId  having count(peopleId) > 1) and rowid not in (select min(rowid) from people group by peopleId having count(peopleId )>1)

5.删除表中多余的重复记录(多个字段),只留有rowid最小的记录


delete from vitae a where (a.peopleId,a.seq) in (select peopleId,seq from vitae group by peopleId,seq having count(*) > 1) and rowid not in (select min(rowid) from vitae group by peopleId,seq having count(*)>1)

看来想偷懒使用一句命令完成这个事好像不太显示,还是老老实实的分步处理吧,思路先建立复制一个临时表,然后对比临时表内的数据,删除主表里的数据


alter table tableName add autoID int auto_increment not null; 

create table tmp select min(autoID) as autoID from tableName group by Name,Address; 

create table tmp2 select tableName.* from tableName,tmp where tableName.autoID = tmp.autoID; 

drop table tableName; 

rename table tmp2 to tableName; 




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