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mysql 根据某个字段只取限制数量的数据问题

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Release： 2016-06-06 09:39:52
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mysql

我限制数据是这样的

产品表
有平台id 产品名称

id ptid name
1 100 产品1
2 100 产品2
3 100 产品3
4 100 产品4
5 100 产品5
6 100 产品6
7 101 产品7
8 101 产品8
9 101 产品9
10 101 产品10
11 101 产品11

如何根据某个平台id 只取这个平台的3条数据（顺序可以随机）

id ptid name
1 100 产品1
2 100 产品2
3 100 产品3
7 101 产品7
8 101 产品8
9 101 产品9

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