使用BigQuery中的条件计算运行总计 [英] Calculate a running total with a condition in BigQuery

问题描述

对不起，不好的话题……我需要计算运行总计，但需要在某种条件下重置总计(当预期达到= 0时).我有这张桌子:

Sorry bad topic… I need to calculate a running total but need to reset the total on a condition (when expected reached = 0). I have this table:

Date, Registrations, Expected Registrations, Expected reached
        2020-03-01, 5, 4,1
        2020-03-02, 7, 5,1
        2020-03-03, 8, 6,1
        2020-03-04, 2, 5,0
        2020-03-05, 5, 4,1
        2020-03-06, 7, 5,1
        2020-03-07, 8, 6,1
        2020-03-08, 2, 5,0

具有累计总数的预期结果-条件是，当预期达到"<>时，应计算0累计总数.如果预期达到" = 0，则运行总计应从0开始:

Expected result with running total - the condition is that while "Expected Reached" <> 0 running total should be calculated. If "Expected Reached" = 0 the running total should start over from 0:

Date, Registrations, Expected Registrations, Expected Reached, Running Total
            2020-03-01, 5, 4,1, 1
            2020-03-02, 7, 5,1, 2
            2020-03-03, 8, 6,1, 3
            2020-03-04, 2, 5,0, 0
            2020-03-05, 5, 4,1, 1
            2020-03-06, 7, 5,1, 2
            2020-03-07, 8, 6,1, 3 
            2020-03-08, 2, 5,0, 0

我不知道如何对窗口函数进行分区以实现此目的.也许我必须在之前创建中间计算，但不确定.有什么建议吗?

I don't know how to partition my window function to do this. Maybe I have to create an intermediate calculation before but Im unsure. Any suggestions?

edit2:删除了我的即时问题".

edit2: removed my "on the fly question".

推荐答案

以下是BigQuery标准SQL

Below is for BigQuery Standard SQL

#standardSQL
SELECT * EXCEPT(grp), 
  SUM(Expected_reached) OVER(PARTITION BY grp ORDER BY `date`) Running_Total
FROM (
  SELECT *, COUNTIF(Expected_reached = 0) OVER(ORDER BY `date`) grp 
  FROM `project.dataset.table`
)

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