Inspector query for users with multiple roles

I am trying to write a query for inspector that would use data from ariba.user.core.Role and ariba.user.core.User

The goal is to identify every user where

a. has role 'Overseas User'

AND

b. has role 'Contract Manager'

select * from ariba.user.core.User where "Roles".UniqueName like 'Contract Manager' and "Roles".UniqueName like 'Overseas User'

This runs with no results but I know via the GUI that there are users who meet this criteria. Am I simply unaware of the correct syntax here?