Comment by benjaminl

Firebase Cloud Firestore is new product from Firebas and is much more flexible than Firebase Realtime Databse.

It can do accomplish that query. From the docs a similar query:

  citiesRef
    .where("population", ">", 100000)
    .orderBy("population")
    .limit(2)

https://firebase.google.com/docs/firestore/query-data/order-...