search

Home >Database >Mysql Tutorial >删除重复的记录,并保存第一条记录或保存最后一条记录

删除重复的记录,并保存第一条记录或保存最后一条记录

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB
WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOriginal
2016-06-07 17:56:491000browse

删除重复的记录,并保存第一条记录或保存最后一条记录

删除表:dgpage中Mail重复的记录并保留最后一条.
delete dgpage where id in ( select a.id from dgpage a, dgpage b where a.mail = b.mail and a.id > b.id )


删除表:dgpage中Mail重复的记录并保留最近一条.
delete dgpage where id in ( select a.id from dgpage a, dgpage b where a.mail = b.mail and a.id
Statement：
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Previous article：SQL Server全文索引服务Next article：如何在SQLSERVER中快速有条件删除海量数据

Related articles

See more