get matched users

This query is marked as a draft This query has been published by AkatsukiRinn.

SQL

SELECT *
FROM (user AS r1 JOIN
       (SELECT CEIL(RAND() *
                     (SELECT MAX(user_id)
                        FROM user)) AS id)
        AS r2
        WHERE r1.user_id >= r2.id LIMIT 1000) AS potentially_matched 
LEFT JOIN 
(SELECT DISTINCT ufg_user, ufg_group FROM user_former_groups) AS user_former_groups
WHERE ufg_group IS NULL
 AND timestampdiff(MONTH, r1.user_registration, '2005-01-31 11:56:57') < 6
 AND 
 LIMIT 200

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