combine

how to combine two query path database

let ref = Database.database().reference()
ref.child("users")
    .child("1")
    .rx
    .observeSingleEvent(.value)
    .subscribe(onNext: { snapshot in
        print("Value:\(snapshot.value)")
    }).disposed(by: disposeBag)

I want to use snapshot value to query other path database
can I extend for the programing?

thank you