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use yourdb
go

select DbRole = g.name, MemberName = u.name, MemberSID = u.sid
  from sys.database_principals u, sys.database_principals g, sys.database_role_members m
 where g.principal_id = m.role_principal_id
   and u.principal_id = m.member_principal_id
 order by 1, 2
go