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mysql关于热题的sql语句

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Release： 2016-06-06 09:39:14
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mysql

有这么个需求，有一张问题表，有问题的创建时间 datetime 还有一个评论数 count

现在我需要根据这个公式来进行排序 count/这条记录存在的时间

这条记录存在的时间指的是现在时间减去创建时间，不知道这个怎么实现，求高手帮忙，时间急迫

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