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一个SQL关联查询的有关问题。求解

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2016-06-13 11:40:08845browse

一个SQL关联查询的问题。求解
目前有三张表

1:PRO表


2:ATTR表



3:ATTR2pro表



先要查  内圈 为 15  外圈为 20  产品关键词为  齿轮 的 所有产品 

一句话SQL 怎么写呢

本人对SQL有待进一步学习。求指点。。

注:MYSQL

sql mysql 关联查询
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