SQL Server select distinct latest values

Question

I have a table that has a ton of rows (>10K). Most of the rows have duplicate role values associated with the username.

What I am tryi

Answer 1

It seems like ISNULL would solve your problem, I use 1 here for simplicity but you could use -1 if that makes more sense for your usage.

MAX(ISNULL(request_id, 1))