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删除重复的记录,并保存第一条记录或保存最后一条记录
来源: 互联网 发布时间:2014-09-05
本文导语: 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...
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
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