json - ノードjsを使用したmysql結果セット全体が配列形式で表示されるのはなぜですか?

Question

次のノード js スクリプトを使用して、mysql の結果セット全体を配列形式で取得します。どのように削除できますか？

var pricingDetail = function(resourceIdentifiers,callback){
    dbconnection.execute(function(err,response){

    if(err){
        throw err;
        }
    else 
        { 

            var selectqueryString = "call SP_ExposePricingDetailforUI('" + resourceIdentifiers + "')";
            response.query(selectqueryString, function(err, result){
            if(err) {   
                throw err;          
            }
            else 
            {
                callback(result);

            }
            });
        }

});
};

結果 ：

[
  {
    "ResourceIdentifier": "vm/hpcloud/nova/small",
    "chargeAmount": 0.071,
    "ChargeAmountUnit": "per hour",
    "CurrencyCode": "USD"
  },
  {
    "ResourceIdentifier": "vm/hpcloud/nova/large",
    "chargeAmount": 0.49,
    "ChargeAmountUnit": "per hour",
    "CurrencyCode": "USD"
  },
  {
    "ResourceIdentifier": "vm/hpcloud/nova/large",
    "chargeAmount": 0.49,
    "ChargeAmountUnit": "per hour",
    "CurrencyCode": "USD"
  },
  {
    "ResourceIdentifier": "vm/hpcloud/nova/large",
    "chargeAmount": 0.8,
    "ChargeAmountUnit": "per hour",
    "CurrencyCode": "USD"
  },
  {
    "ResourceIdentifier": "vm/hpcloud/nova/large",
    "chargeAmount": 0.8,
    "ChargeAmountUnit": "per hour",
    "CurrencyCode": "USD"
  },
  {
    "ResourceIdentifier": "vm/hpcloud/nova/large",
    "chargeAmount": 0.78,
    "ChargeAmountUnit": "per hour",
    "CurrencyCode": "USD"
  },
  {
    "ResourceIdentifier": "vm/hpcloud/nova/large",
    "chargeAmount": 0.78,
    "ChargeAmountUnit": "per hour",
    "CurrencyCode": "USD"
  }
]