BigQuery 模糊匹配加入或使用范圍

Question

在 Big Query 中，有沒有辦法在連接中使用模糊匹配，或者可能使用正則表達式來匹配一系列值？

例如，我有以下查詢，其中“持續時間”值可能相差 +/- 30，因此如果 callhistory.duration = 268 那么它會匹配 calltracking.duration = 292，后者在 238 到 298 的指定范圍內。

select 
calltracking.date,
calltracking.calling_phone_number,
calltracking.duration,
callhistory.row_date,
callhistory.callid,
callhistory.calling_pty,
callhistory.duration,
calltracking.start_time_utc,
callhistory.segstart_utc


from

(SELECT 
cast(date(start_time_local) as string) as date,
calling_phone_number,
start_time_utc,
duration,
utm_medium,
utm_source
FROM [xxx:calltracking.calls]) calltracking

left join 

(select 
 *
 FROM [xxx:datamart.callhistory]) callhistory

on (callhistory.calling_pty = calltracking.calling_phone_number) and 
(callhistory.row_date = calltracking.date) and (callhistory.duration = 
calltracking.duration)

Answer 1

下面的簡化示例適用於 BigQuery 標准 SQL

#standardSQL
WITH `xxx.calltracking.calls` AS (
  SELECT 1 id, 292 duration
), `xxx:datamart.callhistory` AS (
  SELECT 2 id, 268 duration 
)
SELECT 
  t.id tid, 
  t.duration tduration,
  h.id hid,
  h.duration hduration
FROM `xxx.calltracking.calls` t
LEFT JOIN `xxx:datamart.callhistory` h
ON t.duration BETWEEN h.duration - 30 AND h.duration + 30  

注意：這不適用於 BigQuery #legacySQL，它看起來像是您在問題中使用的