New demand generation from available in the form of buckets - sql

Question

I have a requirement where in there are forecasted values of few offices which are linked to one main office.
For example,office 1,office 2, office 3 are linked to mainoffice.Forecasted values are for entire month.Now I need to use some formula to create demand for mainoffice based on its link offices.
1 2 3 4 5 28 29 30
office1 100 200 300 150 120 100 130 160
office2 200 100 150 200 130 160 120 100
office3 400 350 200 400 260 100 130 200
now main office in the month
required output - ((officetotal1+officetotal2+officetotal3)/30)*5
This same value has to be put in the form of 3 buckets for month
i.e 1st 11th and 21st
1 11 21
mainoffice1 X X X
mainoffice2 Y Y Y
Mapping
office mainoffice
------ ---------
office1 mainoffice1/n
office2 mainoffice1/n
office3 mainoffice2/n

Answer 1

You do this with a join. It is something like:
proc sql;
select o.mainoffice, sum(val1) as val1, sum(val2) as val2, . . .
from forecasts f join
offices o
on f.office = o.office
group by o.mainoffice;
The point is to do a join to get the main office information and then to do an aggregation for the values you want.
EDIT:
Then you just add together the values that you want:
select o.mainoffice,
sum(val1 + val2 + . . . val10 + val11) as val1_11,
. . .
from forecasts f join
offices o
on f.office = o.office
group by o.mainoffice;