How can I get a list of categories that share entries with the currently selected category.

Huh? Let me explain

  • I have a channel called Portfolio
  • Portfolio channel has two category groups (client and role)
  • I have a page listing all clients (categories)
  • I would like to list all clients who I have made a website (for example) for

1 Answer 1


{exp:query sql="
    SELECT DISTINCT `cats`.*
    FROM `exp_category_posts` AS `posts`
    INNER JOIN `exp_categories` AS `cats`
    ON `posts`.`cat_id` = `cats`.`cat_id`
    WHERE `group_id` = {group_to_display}
    AND `entry_id` IN (
        SELECT DISTINCT `entry_id`
        FROM `exp_category_posts`
        WHERE `cat_id` = {current_category_id}
    ORDER BY `cat_name` ASC;

I have used preload replace variables to show where the variables would go in the query. In reality you would use Low Seg2cat or something similar.

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