SQL Server query to find last occurred number greater than 0. If there is no number greater than 0 then query should return 0

Question

I have a data like below.

Case A:

Amount (column name)
------
0
0
450
890
0
0

Case B:

Amount (column name)
------
0
0
0
0
0
0

• In case 'A', query should return 890
• In case 'B' query should return 0

I am looking for a SQL Server query which returns the expected results.

Answer 1

Assuming you have an ordering, the simplest method might be:

select coalesce(max(amount), 0)
from (select top (1) amount
      from t
      where amount > 0
      order by <ordering column> desc
     ) t;