How firebase-database- Data validation

hai my dear community here is my problem I created app like there is a account which user can type digits and i have to store those digits in firebase .When user type similar digits then notifier trigger and say “sorry already have digits please type other digits”


where iam mistaking please slove anyone

Your blocks are wrong…

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oh what iam done is total mistake thank you very much for your help

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Mark my ans as solution… So that other can know what’s the solution is @Ramesh

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