google-bigquery - BigQuery 选择多个键值

Question

通过将 Firebase 中的自定义事件导出到 BigQuery，其中可以存在多个键值参数。我似乎无法弄清楚如何使用“标准 SQL”选择其中之一。

Answer 1

假设您想选择 string_value对应于 firebase_event_origin和 int_value与 firebase_screen_id 相关联所有 control_reading事件。您可以将查询表示为:

#standardSQL
SELECT
  (SELECT param.value.string_value
   FROM UNNEST(event_dim.params) AS param
   WHERE param.key = 'firebase_event_origin') AS firebase_event_origin,
  (SELECT param.value.int_value
   FROM UNNEST(event_dim.params) AS param
   WHERE param.key = 'firebase_screen_id') AS firebase_screen_id
FROM `your_dataset.your_table_*`
CROSS JOIN UNNEST(event_dim) AS event_dim
WHERE _TABLE_SUFFIX BETWEEN '20170501' AND '20170503' AND
  event_dim.name = 'control_reading';