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mysql字符串类型的字段排序有关问题

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Release： 2016-06-13 11:32:45
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mysql字符串类型的字段排序问题
我有一个字段A，varchar类型。里面有3条数据，经过order by A DESC排序之后，顺序如下2013.03、2013.02、2013.04
请问如何做到时间最新的排在前面？在不修改数据表字段类型的前提下。

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