Query (SELECT url,short_description,description,skey,state,add_date,statute_description_id,group_concat(tag) as tags FROM statutes Join statute_description on statutes.statute_description_id = statute_description.id and statute_description.status = 0 WHERE (statutes.tag = '' ) AND statutes.status = 0 group by statute_description_id ) Failed. Error : Column 'add_date' in field list is ambiguous