MySQL in-operator必须匹配所有值？

Question

我做了自己的论坛.在进行搜索时,我想找到两个(或更多)特定用户参与的任何线程.我想出了这个:

SELECT * FROM table1 INNER JOIN table2 
ON table1.threadid=table2.threadid 
WHERE table2.threadcontributor IN ('1','52512')

在意识到它实际意味着之前'1' OR '52512'.

有没有办法使它工作,所有id必须匹配？

Answer 1

SELECT * 
    FROM table1 
        INNER JOIN table2 
            ON table1.threadid=table2.threadid 
    WHERE table2.threadcontributor IN ('1','52512')
    GROUP BY table1.PrimaryKey
    HAVING COUNT(DISTINCT table2.threadcontributor) = 2