累計總按周 - PostgreSQL的

Question

使用PostgreSQL，版本9.5.8

下面我有一個工作查詢，這給了我所有賬戶的準備賬戶的PCT。然後這個表格按周分割，給我這個星期創建的賬戶數量，隨後準備就緒。下面

查詢：

SELECT 
       date_trunc('week', al.created_at) as week_created, 
       count(case when ra.status='ready' then 1 end) as total_accounts, 
       count(case when ra.status='ready' AND ra.tests > 0 then 1 end) as accounts_ready, 
       concat(round(count(case when ra.status='ready' AND ra.tests > 0 then 1 end) :: decimal /count(case when ra.status='ready' then 1 end) :: decimal * 100.0), '%') as pct_accounts_ready 

    FROM "ready_accounts" ra 
    JOIN "accounts_list" al 
    ON al.id=ra.id 
    GROUP BY week_created 
    ORDER BY week_created DESC; 

結果集看起來像這樣：

周創---------總帳戶----帳戶準備--- - Pct帳戶準備就緒

Monday 14 Aug ---- 50 ----------------39 ---------------- 78% 
Monday 7 Aug ---- 20 ----------------10 ---------------- 20% 

問題是，我得到的結果不是累積的，他們只是爲了一週，w對於我想要達到的目標來說，這是毫無意義的。

我想一個結果集，它表明代替：

Monday 14 Aug --- 70 ------------------- 49 ---------------- 70% 
Monday 7 Aug --- 20 ------------------- 10 ---------------- 20% 

取樣輸入數據：

的樣本數據看起來像這樣： 準備賬表：

ra.id ra.status ra.tests 
123  ready  1 
124  not_ready 2 
125  not_ready 0 
126  ready  1 
127  ready  0 
128  ready  0 
129  ready  1 

賬戶列表表格：

al.id al.created_at 

123  Monday 14 August 
124  Monday 7 August 
125  Monday 14 August 
126  Monday 14 August 
127  Monday 7 August 
128  Monday 14 August 
129  Monday 31 July 

我已經嘗試了很多解決方案，但都陷入困境。任何解決方案的例子都會很有幫助！

預先感謝您。 我對此很新，所以任何解釋都會很有用！

Answer 1

使用沒有派生表中的最後一列（FROM子句中的子查詢）的查詢並將sum()用作窗口函數。計算外包裝查詢中的百分比：

select 
    week_created, 
    total_accounts, 
    accounts_ready, 
    concat((accounts_ready/ total_accounts* 100)::int, '%') as pct_accounts_ready 
from (
    select 
     week_created, 
     sum(total_accounts) over w as total_accounts, 
     sum(accounts_ready) over w as accounts_ready 
    from (
     select 
      date_trunc('week', al.created_at) as week_created, 
      count(case when ra.status='ready' then 1 end) as total_accounts, 
      count(case when ra.status='ready' and ra.tests > 0 then 1 end) as accounts_ready 
     from "ready_accounts" ra 
     join "accounts_list" al 
     on al.id=ra.id 
     group by week_created 
     ) s 
    window w as (order by week_created) 
    ) s 
order by week_created desc;