how outputting filtered balance results if accountId of DataA is equal to contractorAccountId of DataB? DataA =

Database System Concepts
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ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Question:  how outputting filtered balance results if accountId of DataA is equal to contractorAccountId of DataB?

DataA =
{
  “DataA: [
    {
      "userLoginKey": “08425245”,
      "accountId": “p9xxx”
    },
    {
      "userLoginKey": "09953742,
      "accountId": "97Exxx”
    },
    {
      "userLoginKey": "77424535”,
      "accountId": "jGJjGf"
    },
    {
      "userLoginKey": "08353884”,
      "accountId": "IF4Jo7t"
    },
    {
      "userLoginKey": "77167015",
      "accountId": "9dReBa"
    },
    {
      "userLoginKey": "7711222",
      "accountId": "Sgd4jy"
    },
    {
      "userLoginKey": "7741611",
      "accountId": "Sgd4jy"
    }
}


DataB =
{
  "DataB”: [
    {
      "contractorAccountId": “p9xxx”,
      "balance": 2943
    },
    {
      "contractorAccountId": "97Exxx”,
      "balance": 4927529
    },
    {
      "contractorAccountId": "AgPAWl”,
      "balance": 1000000
    },
    {
      "contractorAccountId": "97Exxx",
      "balance": 957294945
    },
    {
      "contractorAccountId": "p9xxx",
      "balance": null
    },
    {
      "contractorAccountId": "Zsrz2M",
      "balance": 31116496
    },
    {
      "contractorAccountId": "IF4Jo7t",
      "balance": 5
    }
}


If p9xxx of accountId is equal to p9xxx of contractorAccountId, make the code, which will create DataC, at this format.
Also, please do not count null of “balance”
p9xxx(DataA) = p9xxx(DataB) → 2943(DataC), but there is no DataC, so the code has to create DataC like this: 


DataC =
{
  "DataC”: [
    {
      "balance": 2943
    },
    {
      "balance": 4927529
    },
    {
      "balance": 957294945
    },
    {
      "balance": 5
    },
}

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