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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

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Release： 2016-06-07 17:56:49
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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

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
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删除重复的记录 并保存第一条记
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