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

Thank you for all your answer Alex,Aadil,Pradyuman .As you all suggested i have restructure my query as Aadil mentioned and i can query all my data as required .This is my structure

Expense_Month
   |
   --- November_2018
          |
          --- uniqueKey
          |     |
          |     --- expensesName: "gross"
          |     |
          |     --- total: 66
          |     |
          |     --- date_exp: "3_gross"
          |     |
          |     --- current_date: 3

          |
          --- uniquekey
                |
                --- expensesName: "oil"
                |
                --- total: 33
                |
                --- date_exp: "4_oil"
                |
                --- curent_date: 4