SQL Server: Select Top 0?

Question

We just came across this in an old production stored proc (there is a lot more going on in here, but this is in one leg of its logic). Why would someone ever select top 0 ro

Answer 1

To name columns in a UNION ALL

Be sure to read Alex K.'s answer as well. He has a lot of reasons that I have used as well. This was just the most obvious one.