使用 BigQuery 查找每天的运行用户总数

Question

我有一些用户数据如下，我想知道我每天看到的唯一身份用户的总数运行。从基本查询开始：

SELECT
  day, user_id, COUNT(DISTINCT(user_id)) AS cnt

FROM
  (select "A" user_id, "2015-02-01" day),
  (select "A" user_id, "2015-02-01" day),
  (select "A" user_id, "2015-02-01" day),
  (select "A" user_id, "2015-02-01" day),
  (select "A" user_id, "2015-02-01" day),
  (select "A" user_id, "2015-02-01" day),

  (select "B" user_id, "2015-02-01" day),
  (select "B" user_id, "2015-02-02" day),
  (select "B" user_id, "2015-02-02" day),
  (select "B" user_id, "2015-02-02" day),

  (select "C" user_id, "2015-02-01" day),
  (select "C" user_id, "2015-02-02" day),

  (select "D" user_id, "2015-02-04" day)

GROUP BY
  day, user_id

本组成绩为：

Row day         user_id cnt  
1   2015-02-01  A        1   
2   2015-02-01  B        1   
3   2015-02-02  B        1   
4   2015-02-01  C        1   
5   2015-02-02  C        1   
6   2015-02-04  D        1

我可以看到 2015-02-01 上有三个唯一用户，直到 2015-02-04 上没有新用户，而只有一个（用户 D）。

我需要这样的结果：

Row  day         running_count
1    2015-02-01  3
2    2015-02-02  3
3    2015-02-03  3
3    2015-02-04  4

其中 running_count 对应于每天新用户数的运行计数。例如，2015-02-02 为零，因为当天只有 user_id 的 B 和 C 出现，但他们已经被计算在 2015-02-01.

在此先感谢您的帮助。

Answer 1

只查看运行计数的 MIN(date)、SUM() OVER()。它将缺少中间日期，但您可以通过 LEFT JOIN

获得它

SELECT day, SUM(c) OVER(ORDER BY day)
FROM (
  SELECT day, COUNT(DISTINCT user_id) c
  FROM (
    SELECT MIN(day) day, user_id
    FROM
      (select "A" user_id, "2015-02-01" day),
      (select "A" user_id, "2015-02-01" day),
      (select "A" user_id, "2015-02-01" day),
      (select "A" user_id, "2015-02-01" day),
      (select "A" user_id, "2015-02-01" day),
      (select "A" user_id, "2015-02-01" day),

      (select "B" user_id, "2015-02-01" day),
      (select "B" user_id, "2015-02-02" day),
      (select "B" user_id, "2015-02-02" day),
      (select "B" user_id, "2015-02-02" day),

      (select "C" user_id, "2015-02-01" day),
      (select "C" user_id, "2015-02-02" day),

      (select "D" user_id, "2015-02-04" day)
    GROUP BY user_id
  ) 
  GROUP BY day
)

使用 BigQuery 查找每天的运行用户总数

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使用 BigQuery 查找每天的运行用户总数