SELECT CAST(gacera as decimal (18,4))-CAST(t2.raodenoba as decimal (18,4)) as mins , *  FROM [ITN_SOFT_NOTEB].[dbo].[GETPRODUCT] as t1

left join (select barcode,faqtura, sum (CAST (raodenoba as decimal (18,4))) as raodenoba from[ITN_SOFT_NOTEB].[dbo].gacera group by barcode,faqtura) as t2
on t1.zednomeri=t2.faqtura and t1.shtrixkodi=t2.barcode


 where  CAST(gacera as decimal (18,4))>0
 
 order by mins