Question

我在BigQuery中有很多具有不同表后缀的表，其中每个表在每行中都有四个级别的结构。我进行查询以将其取消嵌套到展平表中。

SELECT
  report_date,
  tracker,
  source,
  countryCode,
  stageNum,
  bundleId,
  offer_name,
  places.name AS site_id,
  places.clicks,
  places.cost,
  places.p_leads_v2_
FROM (
  SELECT
    report_date,
    tracker,
    source,
    countryCode,
    stageNum,
    bundleId,
    offer.name AS offer_name,
    offer.places
  FROM (
    SELECT
      report_date,
      tracker,
      source,
      campaigns.countryCode,
      campaigns.stageNum,
      campaigns.bundleId,
      campaigns.offer
    FROM
      `dv3.tracker_recording.records_*` AS t,
      t.campaigns ) AS t1,
    t1.offer) AS t2,
  t2.places

它工作正常，但效果不是很好，因为它似乎太长了。如何使它更简单，更有效？有什么建议。谢谢。

Answer 1

您是否尝试过类似的查询？

SELECT 
report_date,
tracker,
source,
c.countryCode,
c.stageNum,
c.bundleId,   
o.name as offer_name,
p.name AS site_id,
p.clicks,
p.cost,
p.p_leads_v2_
FROM `dv3.tracker_recording.records_*` as t, UNNEST(t.campaigns) as c, UNNEST(c.offer) as o, UNNEST(o.places) as p

如何取消嵌套BigQuery中的多层结构？

1 个答案: