Question

我正在将帐单数据从Google Cloud Platform导出到BigQuery（BQ）。当前的任务是建立一个将UNNEST相关数据存储到新的“平面”表中的查询 BQ中的数据结构是这样的：

[{
"billing_account_id": "01234-1778EC-123456",
"service": {
  "id": "2062-016F-44A2",
  "description": "Maps" 
},
"sku": {
  "id": "5D8F-0D17-AAA2",
  "description": "Google Maps"
},
"usage_start_time": "2018-11-05 14:45:00 UTC",
"usage_end_time": "2018-11-05 15:00:00 UTC",
"project": {
  "id": null,
  "name": null,
  "labels": []
},
"labels": [],
"system_labels": [],
"location": null,
"export_time": "2018-11-05 21:54:09.779 UTC",
"cost": "5.0",
"currency": "EUR",
"currency_conversion_rate": "0.87860000000017424",
"usage": {
  "amount": "900.0",
  "unit": "seconds",
  "amount_in_pricing_units": "0.00034674063800277393",
  "pricing_unit": "month"
},
"credits": "-1.25",
"invoice": {
  "month": "201811"
}

}，

我希望安排一个每天仅使用这种模式构建新表的工作

billing_account_id, usage_start_time, usage_end_time, cost, credit_amount

到目前为止，我在这里：

select billing_account_id, usage_start_time, usage_end_time, cost, credits AS CREDITS from clientBilling.gcp_billing_export_v1_XXXX , UNNEST(credits);

但是结果中，信用额仍然嵌套，而不是我需要的“固定”额度。欢迎任何输入，谢谢！：）

Result

Answer 1

credits是一个结构数组（每个结构都是“名称，数量”）-BigQuery中的“重复”记录-因此，您必须首先取消嵌套该数组，然后引用所需的结构成员。 / p>

因此：

UNNEST信用记录
将credits.amount结构成员别名为credit_amount

SELECT billing_account_id, usage_start_time, usage_end_time, cost, credit.amount as credit_amount FROM `optimum-rock-145719.billing_export.gcp_billing_export_v1*`, UNNEST(credits) as credit

这将返回只包含credits.amount列作为credits_amount的结果表。您正在执行第1步，而不是第2步，并忽略了SELECT子句中未嵌套的字段。

BQ：如何UNNEST进入新表

1 个答案: