Linking two table..it is look like unpivot but it is not

Question

Hi guys, I got a situation like this:
Table A
create table #fly (company varchar (50), period varchar(6), adcost (int), ppcost (int))
insert into #fly values ('PanAm', '201401', 100, 200) ,  ('PanAm', '201402', 200, 200) , ('PanAm', '201403', 700, 1000), ('EGAm', '201401', 1100, 1200), ('EGAm', '201402', 7100, 7200)                                                                                                                 
Table 2 #Cost (firm varchar (100), client varchar (100), period varchar(6), element (varchar 10), tot int) insert into #firm ('Zuck', ''Panam', '201401', ''adcost', 40), ('Zuck', ''Eagam', '201401', ''adcost', 40), ('Zuck', ''Panam', '201402', ''ppcost', 240)                
As you can see I got in fly the field adcost that is a value in the table #cost. I need to link the two table and I'm wondering whitch is the best way. Another issue is the adcost (#fly) has in #cost two relatives adcost and fixadcost element. I should consider
both the elements as adcost.  Advices? Thanks

Answer 1

create table #fly (company varchar (50), period varchar(6), adcost int, ppcost int)
insert into #fly values ('PanAm', '201401', 100, 200) , ('PanAm', '201402', 200, 200) , ('PanAm', '201403', 700, 1000), ('EGAm', '201401', 1100, 1200), ('EGAm', '201402', 7100, 7200)
create table #Cost (firm varchar (100), client varchar (100), period varchar(6), element varchar (20), tot int)
insert into #cost values ('Zuck', 'Panam', '201401', 'adcost', 40), ('Zuck', 'Eagam', '201401', 'adcost', 40)
, ('Zuck', 'Panam', '201401', 'fixedadcost', 40)
, ('Ford', 'Panam', '201401','ppcost', 240)
select * from #Cost
select * from #Fly
Select company,f.period,adcost, (c1.tot+c2.tot) as [adcost + fixedadcost] , ppcost, c3.tot as [ppcost from Cost] from (select company,period,adcost,ppcost from #Fly
WHERE company='PanAM' AND period='201401') f
left join #Cost c1 on c1.period = f.period AND c1.client=f.company AND c1.element ='adcost'
left join #Cost c2 on c2.period = f.period AND c2.client=f.company AND c2.element ='fixedadcost'
left join #Cost c3 on c2.period = f.period AND c3.client=f.company AND c3.element ='ppcost'
drop table #Cost, #Fly