Oracle aggregation function to allocate amount

Question

Suppose I have 2 tables T1 and T2 as follows

T1:

bag_id bag_type capacity
------|--------|--------
  1       A             


        

Answer 1

You are looking for a cumulative sum. Something like this:

select t1.*,
       (case when cumecap <= t2.item_amount 
             then t1.capacity
             when cumecap - t1.capacity <= t2.item_amount
             then t2.item_amount - (cumecap - t1.capacity)
             else 0
        end) as allocated_capacity
from (select t1.*,
             sum(t1.capacity) over (partition by bag_type order by bag_id) as cumecap
      from t1
     ) t1 join
     t2
     on t1.bag_type = t2.item_type;