Question

我有一些用户数据，如下所示，我希望每天看到的唯一身份用户数总计。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

该小组的结果是：

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上有三个唯一身份用户，而2015-02-04之前没有新用户，只有一个用户（用户D）。

我需要将结果看起来像这样：

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

running_count对应于每天新用户数量的运行记录。例如，2015-02-02为零，因为只有user_id的B＆amp; C出现在当天，但已经计入2015-02-01。

提前感谢您的帮助。

Answer 1

仅查看MIN（日期），SUM（）OVER（）以查看运行计数。它将缺少临时日期，但您可以通过LEFT JOIN

获得

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查找每天运行的用户总数

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