How to perfom query SQL IN clause in Firebase Android

Question

How do I query SQL IN clause in Firebase Android? I want to use it in a Firebase Recycler adapter to retrieve only some children based on some condition. Something like the foll

Answer 1

The Firebase database does not have the equivalent of SQL's WHERE id IN (1,2,3). In the case of selecting by ID, Firebase's way of retrieving items is equally fast because Firebase pipelines the requests.

Your case is different though, since you're not selecting by ID. Unfortunately there is no way to directly map your query to a equivalent on the Firebase Database.

Instead of trying to make Firebase's NoSQL database do SQL tricks, I highly recommend that you start mapping your data model to something that fits better with a NoSQL database. Some great resources to kick start this process are this article on NoSQL data modeling and our new video series on Firebase for SQL developers.

Also see Firebase complex "contain" queries