Data Extract - Partitioning

Hello,

I have a table containing 3 columns Department Name, RiskScenario and Cost. I am trying to create a data extract that contains the top 3 Risk Scenarios (sorted by Cost) per Department.

I tried using this sql statement in MSQuery but it doesn't work. Any ideas where I'm going wrong or if there is a simpler way to do this?

Select * from (
Select DepartmentName, `Risk Scenario`, Cost, row_number() OVER (PARTITION BY DepartmentName order by Cost) rn
FROM 'Departmental Risks`) where rn <=3

Please help. Just can't figure this out!

Meera