Question

I have the following situation

ID   Value
1    50
1    60
2    70
2    80
1    0
2    50

I need to run a query that would return summed value, grouped by ID. The catch is if the value is 0, then the entire sum should be 0.

Query results would be

ID   Value
1    0
2    200

I tried

select ID, case 
when Value> 0 then sum(Value) * 1
when Value= 0 then sum(value) * 0
end
from table

but that did not work.

Answer 1

select ID,
       sum(value)*sign(min(abs(value))) as [sum(value)]
from YourTable
group by ID

With a case if you like:

select ID,
       case sign(min(abs(value)))
         when 0 then 0 
         else sum(value)
       end  as [sum(value)]
from YourTable
group by ID