What are queries 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.

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What is order by child in Firebase?

When using orderByChild() , data that contains the specified child key is ordered as follows: Children with a null value for the specified child key come first. Children with a value of false for the specified child key come next. If multiple children have a value of false , they are sorted lexicographically by key.

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