MySQL WHERE <multiple-column> IN <subquery>

Question

有没有办法(没有JOIN)WHERE在2列(OR)IN子查询上使用子句？目前,我正在做

WHERE 'col1' IN
(
    SELECT id FROM table
) OR 'col2' IN
(
    SELECT id FROM table
)

而且我相信我能做得更好:).我也试过,WHERE ('col1', 'col2') IN <subquery>但MySQL说:Operand should contain 2 column(s)

谢谢你的帮助.

编辑:通过"不加入",我的意思是我正在进行许多加入:http://pastebin.com/bRfD21W9 ,正如您所看到的,子查询位于另一个表上.

Answer 1

SELECT *
FROM table

WHERE 
(col_1, col_2) NOT IN
 (SELECT col_1, col_2 FROM table)

Answer 2

像这样重写你的代码就可以了：

WHERE ('col1', 'col2') IN
(
    SELECT id, id FROM table
)

Answer 3

我读到你不同意JOIN，但只是另一种方法。看看join它friends是否对你有用。

SELECT `timeline`.`action`, `timeline`.`data`, `timeline`.`tlupdate`,
            u1.`id` AS ufrom_id, u1.`username` AS ufrom_username, u1.`firstname` AS ufrom_firstname, u1.`lastname` AS ufrom_lastname, u1.`picture` AS ufrom_picture,
            u2.`id` AS uto_id, u2.`username` AS uto_username, u2.`firstname` AS uto_firstname, u2.`lastname` AS uto_lastname, u2.`picture` AS uto_picture,
            m.`id` AS m_id, m.`name` AS m_name, m.`alternative_name` AS m_altname, m.`tiny_img` AS m_tiny, m.`normal_img` AS m_normal
    FROM `timeline`
    JOIN `users` u1 ON u1.`id` = `timeline`.`user_id_from`
    JOIN `users` u2 ON u2.`id` = `timeline`.`user_id_to`
    JOIN `friends` f on f.`idol_id`=u1.`id` or f.`idol_id`=u2.`id`
    JOIN `movies` m ON m.`id` = `timeline`.`movie_id`;

更新：

当您使用时，inner join您也可以这样做以避免完整结果集的条件。

JOIN `friends` f on ((f.`idol_id`=u1.`id` or f.`idol_id`=u2.`id`) and f.idol_id = ?)

您可以使用DISTINCT或使用GROUP BY来获得独特的结果。