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What Are the other Firebase Filtering methods?

The Firebase offers some of other filtering method looks like - 1.      startAt(), 2.      endAt(), 3.      equalTo() and 4.      orderByChild() Example - var usersRef = firebase . database (). ref ( "users/" ); usersRef . orderByChild ( "name" ). startAt ( "Anil" ). on ( "child_added" , function ( result ) {         console . log ( "Start at filter - " + result . val (). name ); }); usersRef . orderByChild ( "name" ). endAt ( "Sunil" ). on ( "child_added" , function ( result ) {         console . log ( "End at filter - " + result . val (). name ); }); usersRef . orderByChild ( "name" ). equalTo ( "Aradhya" ). on ( "child_added" , function ( result ) {         console . log ( "Equal to filter - " + result . val (). name ); }); usersRef . orderByChild ( "age" )....