多个窗口函数的累积和 [英] Cumulative sum of multiple window functions

问题描述

我有一个结构如下的表：

I have a table with the structure:

id | date       | player_id | score
--------------------------------------
1  | 2019-01-01 | 1         | 1
2  | 2019-01-02 | 1         | 1
3  | 2019-01-03 | 1         | 0
4  | 2019-01-04 | 1         | 0
5  | 2019-01-05 | 1         | 1
6  | 2019-01-06 | 1         | 1
7  | 2019-01-07 | 1         | 0
8  | 2019-01-08 | 1         | 1
9  | 2019-01-09 | 1         | 0
10 | 2019-01-10 | 1         | 0
11 | 2019-01-11 | 1         | 1

我想再创建两列， total_score， last_seven_days。

I want to create two more columns, 'total_score', 'last_seven_days'.

total_score是player_id得分的滚动总和

total_score is a rolling sum of the player_id score

last_seven_days是最近7天（包括之前和之后）的得分日期

last_seven_days is the score for the last seven days including to and prior to the date

我编写了以下SQL查询：

I have written the following SQL query:

SELECT id,
    date,
    player_id,
    score,
    sum(score) OVER all_scores AS all_score,
    sum(score) OVER last_seven AS last_seven_score
   FROM scores
  WINDOW all_scores AS (PARTITION BY player_id ORDER BY id ROWS BETWEEN UNBOUNDED PRECEDING AND 1 PRECEDING), 
last_seven AS (PARTITION BY player_id ORDER BY id ROWS BETWEEN 7 PRECEDING AND 1 PRECEDING);

并获得以下输出：

id | date       | player_id | score | all_score | last_seven_score   
------------------------------------------------------------------
1  | 2019-01-01 | 1         | 1     |           | 
2  | 2019-01-02 | 1         | 1     | 1         | 1
3  | 2019-01-03 | 1         | 0     | 2         | 2
4  | 2019-01-04 | 1         | 0     | 2         | 2
5  | 2019-01-05 | 1         | 1     | 2         | 2
6  | 2019-01-06 | 1         | 1     | 3         | 3
7  | 2019-01-07 | 1         | 0     | 4         | 4
8  | 2019-01-08 | 1         | 1     | 4         | 4
9  | 2019-01-09 | 1         | 0     | 5         | 4
10 | 2019-01-10 | 1         | 0     | 5         | 3
11 | 2019-01-11 | 1         | 1     | 5         | 3

我意识到我需要更改此

last_seven AS（按玩家ID顺序排列ID排在7个开头和1个开头之间）

而不是7，而是使用某种日期格式，因为仅使用数字7会引入错误。

to instead of being 7, to use some sort of date format because just having the number 7 will introduce errors.

ie能够执行日期-2天或日期-6天

我还想添加3个月，6个月，12个月之后的列，因此需要它能够保持动态。

I also would like to add columns such as 3 months, 6 months, 12 months later down the track and so need it to be able to be dynamic.

DEMO

推荐答案

演示：db<>小提琴

Postgres 11 + 的解决方案：

像@LaurenzAlbe一样使用 RANGE区间

Using RANGE interval as @LaurenzAlbe did

Postgres< 11 的解决方案：

（仅显示天部分，即 all_scores 部分是相同的）

(just presenting the "days" part, the "all_scores" part is the same)

在 player_id 和$ vant date 范围：

Joining the table against itself on the player_id and the relevant date range:

SELECT s1.*,
    (SELECT SUM(s2.score)
     FROM scores s2
     WHERE s2.player_id = s1.player_id
         AND s2."date" BETWEEN s1."date" - interval '7 days' AND s1."date" - interval '1 days')
FROM scores s1

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