Find if child inside child data is exist or not Android Firebase

Question

This may be duplicate Question but i have tries alot but i didnt get my result, Here is my firebase structure

Updated

I need to fin

Answer 1

To solve this, I recommend you to change your database structure a little bit. Because there is no way to use in a query dynamic values, or wildcards, you database schema should look like this:

Expense_monts
   |
   --- November_2018
          |
          --- -LQ ... Gb
          |     |
          |     --- expensesName: "gross"
          |     |
          |     --- total: 66
          |     |
          |     --- day: "Monday"
          |
          --- -LQ ... LO
                |
                --- expensesName: "oil"
                |
                --- total: 33
                |
                --- day: "Tuesday"

As you can see, there is no need to use that extra child (3, 4 and so on). In this case, a query that looks like this:

expensesaddref = databaseReference.child(username).child("Expense_Month").child(monthyr);
expensesaddref.orderByChild("expensesName").equalTo("oil")
    .addListenerForSingleValueEvent(/* ... */);

Will work perfectly fine.