Try this , it will give you secrity roles and their membership.
select vi.Name as [Group] , v2.Name as Member from [ResourceAssociation] ra
join vitem vi on vi.guid = ra.ParentResourceGuid
join vitem v2 on v2.guid = ra.ChildResourceGuid
where ra.ResourceAssociationTypeGuid = '63468F04-6751-448D-891C-B59906360A27'