Question

I have an excel function: =Max(0, -Min(A1-B1, C1-B1))

and A1,B1,C1 are the Value column in the table:

Date, Key, Value

assume for now the Date is irrelevant and the Key is A,B,C for A1,B1,C1

How do I implement this excel function? The way I originally did it I had two joins (to get the values all in separate columns on the same row) but this seemed like overkill and there must be a smarter way?

Answer 1

You could probably reduce it to one join, since you only need B for the A part:

select  case 
        when min(Value - isnull(yt2.Value,0)) > 0 then 0
        else -min(Value - isnull(yt2.Value,0))
        end
from    YourTable yt1
join    YourTable yt2
on      yt1.Key = 'A' and yt2.key = 'B'
        or
        yt1.Key = 'B' and yt2.key = 'C'