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mysql查询数据，比较数据大小

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Release： 2016-06-06 09:45:28
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mysql

我现在碰到的问题: 在一个列的信息中查处2013年6月8日前的信息(该列值是一个varchar2类型，而且值中的第2位为年，第3位为月，第4位为日信息).而2013使用N表示(2000年开始用字母A,B.C...表示),月份超过10的用字母A，B。。。表示，日期超过10的也用A，B。。。表示 我要怎么使用MYSQL语句直接查出数据呢（是mysql，不是oracle）,数据可能有一百多万笔。。。
如：NN68KKKKKKKK这个值表示是2013年6月8号生产的信息

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