INSERT INTO QandA(id, title, content, tags, date_time, user_id)
SELECT NULL, :title, :content, :tags, unix_timestamp(), :id
FROM QandA
WHERE user_id = :id
   AND NOT EXISTS (
        SELECT COUNT(CASE WHEN date_time > now() - INTERVAL 90 MINUTE THEN 1 ELSE NULL END) AS rowsInLast90Min
             , COUNT(CASE WHEN date_time > now() - INTERVAL 1 DAY     THEN 1 ELSE NULL END) AS rowsInLastDay
             , COUNT(CASE WHEN date_time > now() - INTERVAL 1 MONTH   THEN 1 ELSE NULL END) AS rowsInLastMonth
             , COUNT(CASE WHEN date_time > now() - INTERVAL 1 YEAR    THEN 1 ELSE NULL END) AS rowsInLastYear
        FROM cookie
        WHERE email = $email
        HAVING rowsInLast90Min > 0
            OR rowsInLastDay   > 6
            OR rowsInLastMonth > 50
            OR rowsInLastYear  > 200
    )