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Combinando os resultados da união em uma linha quando algumas colunas têm valores diferentes


Remover tracking_id das subconsultas e use union :
(select trv.requested_date, trv.requested_status
from  tbl_trackvalue as trv, tbl_tracking as t , tbl_offers as off , tblusers as usr
where t.id=trv.tracking_id  and off.id=t.offer_id and  usr.id=trv.tr_user_id and usr.id='1454' 
and trv.payment_status='pending' and trv.requested_status='declined'  group by trv.tr_user_id, trv.requested_date order by trv.requested_date asc )
union
(select mlc.requested_date, mlc.requested_status
from  tbl_trackvalue as trv ,tbl_tracking as t , tbl_offers as off , tblusers as usr, tbl_mailchimp_trackvalue as mlc
where trv.tracking_id=mlc.tracking_id  and off.id=t.offer_id and  usr.id=trv.tr_user_id and usr.id='1454' 
and mlc.payment_status='pending' and mlc.requested_status='declined'  group by trv.tr_user_id, mlc.requested_date order by mlc.requested_date asc )