LEFT OUTER JOIN archive_parts ap ON ap.backup_part_id = p.id
LEFT OUTER JOIN archive_burned ab ON ab.archive_id = ap.archive_id
GROUP BY p.id,filename,b.date,age,p.size,p.part_nr
LEFT OUTER JOIN archive_parts ap ON ap.backup_part_id = p.id
LEFT OUTER JOIN archive_burned ab ON ab.archive_id = ap.archive_id
GROUP BY p.id,filename,b.date,age,p.size,p.part_nr