Errormessage: 
    SELECT DISTINCT a.cat_id, b.name, b.url, tot FROM 
    (SELECT distinct b.cat_id , count(b.cat_id)  tot
    FROM comclass a
    JOIN comclass b on a.comp_id = b.comp_id
    where a.cat_id =  12572
    AND b.cat_id !=  12572
    GROUP BY b.cat_id HAVING tot > 2  ORDER BY tot desc LIMIT 50 ) a
    JOIN comclass c ON c.cat_id = a.cat_id
    JOIN categories b ON b.id = a.cat_id
    WHERE c.city_id =  43598
    LIMIT 5
MySQL server has gone away