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mysql排序调取数据

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Jun 06, 2016 pm 08:38 PM

php

一个提问有个创建时间，有个最新回答时间，如何按照没有回答，就按创建时间排序，就像sf上的最新排序调取数据一样

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一个提问有个创建时间，有个最新回答时间，如何按照没有回答，就按创建时间排序，就像sf上的最新排序调取数据一样

可以在创建问题的时候，把最新回答时间answerTime和创建时间createTime设置成一样的，当有人回答的时候修改最新回答时间answerTime。这样的话，就可以直接按照最新回答时间进行排序读取数据 ORDER BY answerTime,这样根本就不用去考虑是否已经有人回答过这个问题

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