在postgres中聚集多个列

Question

我在使用值集合时遇到麻烦。我的表看起来像这样：

CREATE TABLE test2 (a_date date, a_actif integer[], a_registred   integer[], a_filter integer, sum_actions integer );
INSERT INTO test2 VALUES
('2016-12-15', array[1,2,3], array[1,4], 5, 2),
('2016-12-15', array[5], array[1,4], 2, 20),
('2016-12-15', array[6,2,3], array[2,3], 3, 10),
('2016-12-15', array[8,2,3], array[4,1], 1, 4);

目标是计算不同的a_actif和a_registred，并获得每个日期的动作数量总和。 这应该是这样的：

-----------------------------------------------------------
|  Date    |  Active_count | Register_count | sum_actions |
-----------------------------------------------------------
|2016-12-15|    6          |      4         |  36         |
-----------------------------------------------------------

Active_count：a_actif的DISTINCT ID

Register_count：a_registred的DISTINCT ID

所以我做了类似的事情，但行动的总和是错误的

SELECT f.date, COUNT(DISTINCT f.actifs), COUNT(DISTINCT f.registers), SUM(sum_actions)
FROM
(   
 SELECT unnest(a_actif) as actifs, a_date as date, unnest(a_registred) as registers, sum_actions
FROM test2
WHERE a_filter IN ('1','2','3','5')
) f
--WHERE date BETWEEN XX and YY
GROUP BY f.date;

有什么想法吗？

http://rextester.com/CXWG2246

Answer 1

<强> SQL DEMO

WITH t_count as (
    SELECT f.date, COUNT(DISTINCT f.actifs), COUNT(DISTINCT f.registers)
    FROM
    (   
        SELECT  unnest(a_actif) as actifs, 
                a_date as date, 
                unnest(a_registred) as registers
        FROM test2
        WHERE a_filter IN ('1','2','3','5')
    ) f
    --WHERE date BETWEEN '2016-09-01' AND '2016-09-01'
    GROUP BY f.date
), t_sum as (
    SELECT a_date as date, SUM(sum_actions) total
    FROM test2
    WHERE a_filter IN ('1','2','3','5')    
    --WHERE date BETWEEN '2016-09-01' AND '2016-09-01'
    GROUP BY date
)        
SELECT  t1.*, t2.total
FROM t_count t1
JOIN t_sum   t2
  ON t1.date = t2.date

输出