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请问一个mysql查询有关问题,送上100分

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WBOYOriginal
2016-06-13 12:31:26876browse

请教一个mysql查询问题,送上100分

本帖最后由 SHANDIANDIAN 于 2013-12-12 12:15:27 编辑 表A                表B
uid  mid cash          uid   mid cash   number
1     1   100           1     1   101    100
2     2   105           2     1   100    100
3     3   98            3     2   105    200
4     4   55            4     2   105    300
5     5   60            5     3   60     300
6     6   70            6     3   98     300

uid 是自动增长字段  mid和cash 是关联字段

我想统计出 表B的求和数量就和下面这样,没匹配到表A就显示0,匹配通过mid和cash 两字段。请问SQL该怎么写?? 以表A为基础表
结果表
uid mid   cash  number
1    1     100  100
2    2     105  500
3    3     98   300
4    4     55    0
5    5     60    0
6    6     70    0
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