Max13 Max13 - 1 year ago 117
MySQL Question

MySQL WHERE <multiple-column> IN <subquery>

Is there a way (without JOIN) to use the

clause on 2 columns (OR)
a subquery?
Currently, I'm doing

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

And I'm sure I can do better :) . i've also tried
WHERE ('col1', 'col2') IN <subquery>
but MySQL says:
Operand should contain 2 column(s)

Thanks for your help.

Edit: By "No join", I mean I'm alreeady making many joins:, and as you can see, the subqueries are on another table.

Answer Source

I Read you are not agree with JOIN, but just another way to do it.. See join with friends if it is useful to you..

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`;


As you are using inner join You can this too to avoid the condition on complete resultSet.

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

Either you can use DISTINCT or use GROUP BY to get unique result.

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