Bigquery - 为每个 ID 添加完整的日期范围 [英] Bigquery - Add full date range to each id

问题描述

我如何将 GENERATE_DATE_ARRAY(start_date, end_date[, INTERVAL INT64_expr date_part]) 应用于数据集中的每条记录.我了解如何应用它来获取从开始到结束的单个日期范围，但不知道如何将相同的日期数组应用于每个 id.

How can i apply GENERATE_DATE_ARRAY(start_date, end_date[, INTERVAL INT64_expr date_part]) to each record in a dataset. I understand how to apply it to get a single date range from start to end, but don't know how to apply the same date array to each id.

假设我有两个不同 ID 的 x 和 y，日期如下:

Say i have two distinct ID's x and y with the following dates:

      |id|date
      --------------
    1 |x |2021-01-01
    2 |x |2021-01-03 
    3 |y |2021-01-06 
    4 |y |2021-01-09

我想为每个 ID 填写日期间隔

and i want to fill in the date gap for each ID

我怎样才能实现以下输出?

How can i achieve the following output?

      |id|date
      --------------
    1 |x |2021-01-01 
    2 |x |2021-01-02 
    3 |x |2021-01-03
    4 |y |2021-01-06 
    5 |y |2021-01-07
    6 |y |2021-01-08
    7 |y |2021-01-09

推荐答案

以下是 BigQuery Standard SQL

Below is for BigQuery Standard SQL

select id, date from (
  select id, date, lead(date) over(partition by id order by date) next_date
  from `project.dataset.table`
), unnest(generate_date_array(date, next_date)) date 
where not next_date is null
-- order by date    

如果适用于您问题中的样本数据 - 输出为

if to apply to sample data from your question - output is

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