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这种查询要求的SQL语句应该如何写

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Release： 2016-06-13 12:19:19
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这种查询要求的SQL语句应该怎么写
表如下

A               B            
中国          1
中国          2
中国          3
美国          4
美国          5
英国          6
英国          7
.
.
.

-------------------最终查询出来结果要求是下面这样的
中国             1，2，3
美国             4，5
英国             6，7

我之前过直接用GROUP BY ，但A字段是能分组出来，但B字段的集合怎么出现呀？难道要再嵌一个SQL？？？
------解决思路----------------------

select A, group_concat(B) as B from 表 group by A
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Related labels：
concat nbsp select sql
source：php.cn
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