Can we write query in Firebase?

Firebase queries. Firebase queries are modifications of a ref . So you’ll create a ref as usual, but then you’ll add some query parameters to it. Once you add query parameters to a ref, you can’t take them off or change them… you’d need to create a new ref for that.

Queries can only order by one key at a time . Calling orderByChild() multiple times on the same query is an error. Firebase queries allow you to order your data by any child key on the fly.11 Mar 2021

Firebase – Queries