select  a.*,am.level  from jos_wmart_article as a left join jos_wmart_article_map as am on a.id=am.item_id and am.item_id=am.children_id where a.parent_id=3164 group by a.id order by a.ordering
err: 1021 Disk full (/tmp/#sql-temptable-132c77-5c0e1-2441a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")