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I have two firebase realtime db queries.

Query 1 : firebase.database().ref("Messages/" + suid).child(ids + "/chat").orderByKey().limitToLast(1); Query 2 : firebase.database().ref(`Messages/${suid}/${ids}/chat`).orderByKey().limitToLast(1);

Both queries are working fine, what is difference between query 1 and query 2. Is Query 2 technically correct/reliable or efficient from Query 1. Will it save my download bandwidth?

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There is no difference, in any case you have a DatabaseReference instance.

A Firebase reference represents a particular location in your Database and can be used for reading or writing data to that Database location.

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