Question

我喜欢编写一个sql查询来计算每个用户使用该应用程序的天数以及多少个并发天数。用户可以每天多次输入应用，但应该计为1。

我的表格如下：

id            | bigint 
user_id       | bigint         
action_date   | timestamp without time zone

Answer 1

计算每位用户的天数：

SELECT user_id, count(DISTINCT action_date::date) AS days
FROM   user_action_tbl
GROUP  BY user_id;

Answer 2

一种方法

SELECT user_id, COUNT(*) days_total, SUM(conseq) days_consecutive
  FROM
(  
  SELECT user_id, 
         CASE WHEN LEAD(date, 1) OVER (PARTITION BY user_id ORDER BY date) - date = 1 THEN 1 ELSE 0 END consecutive 
    FROM 
  (
    SELECT user_id, action_date::date date
      FROM table1
     GROUP BY user_id, action_date::date
  ) q
) p
 GROUP BY user_id

这是 SQLFiddle 演示

sql - 查找用户使用该应用程序的天数

2 个答案: