Eyewear Coupon Codes

An error occurred: select s.store_id, s.storename, s.store_url, s.web_address,s.store_logo, c.tracking_link,c.imp_code, date_format(c.exp_date,'%b %d, %Y') as exp_date , date_format(c.start_date,'%b %d, %Y') as start_date , c.coupon_code, c.coupon_desc, c.couponname, c.coupon_id, c.coupon_type,c.discount_image,c.currency,date_format(c.added_date,'%b %d, %Y') as added_date ,c.user_submitted, c.username, c.exclusive, c.voten, c.votey,c.edited_date from stores s, coupons c where s.store_id = c.store_id and c.status='ENA' and (c.exp_date >= CURDATE() or c.exp_date=0000-00-00) and c.primary_category = '4993' group by s.store_id order by c.exp_date ASC limit 20
1055 -- Expression #6 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'dealzspo_ut.c.tracking_link' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by