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 <b.id )
原创文章，作者：carmelaweatherly，如若转载，请注明出处：https://blog.ytso.com/tech/database/233349.html