你说共有3个以上的利息ID,所以你的意思是“至少4”,对不对?
SELECT first1.userid, second1.userid
FROM users_interests first1, users_interests second1,
users_interests first2, users_interests second2,
users_interests first3, users_interests second3,
users_interests first4, users_interests second4
WHERE
first2.userid=first1.userid AND first3.userid=first1.userid AND first4.userid=first1.userid AND
second2.userid=second1.userid AND second3.userid=second1.userid AND second4.userid=second1.userid AND
first1.userid<>second1.userid AND
first1.interestid=second1.interestid AND
first2.interestid=second2.interestid AND first2.interestid<>first1.interestid AND
first3.interestid=second3.interestid AND first3.interestid<>first2.interestid AND first3.interestid<>first1.interestid AND
first4.interestid=second4.interestid AND first4.interestid<>first3.interestid AND first4.interestid<>first2.interestid AND first4.interestid<>first1.interestid
因为我没有测试过这个,请记住它可能有错误,所以只有在你理解的时候才使用它。
如果您需要相同的其他数量的共同兴趣,我相信您可以编写代码来动态生成任何数量的查询。另外,如果您需要名称,我相信您可以将必要的四个连接添加到interests
表中,并将相关列添加到SELECT
子句中。
惊人!谢谢你,这个作品非常漂亮! – Ryan 2010-08-15 07:21:09