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mysql 如何通过一个sql语句搜出比例关系

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Release： 2016-06-06 09:36:58
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mysqlsql

例如 一个表格里有
商品，价格，日期 三个字段
a 10.2，20151008
a 9.2，20151009
a 7.2，20151010
b 11.2，20151008
b 10.2，20151008

我要搜 在历史上各个商品价格低于10￥的次数占该商品出现的总次数的百分比，应该如何写mysql语句呢？
谢谢了
搜出结果要类似
a 2/3
b 0/2

这样的sql语句怎么写呢？

Related labels：
mysql sql
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