如何在 mysql 中使用 group by 時獲取條件計數？

Question

Mysql 新手在這里。

我有一個像這樣的表（名稱：'audit_webservice_aua'）：

+---------+------------------------------------+-------------------+------------------------+
| auditId |          device_code               |   response_status |       request_date
+---------+------------------------------------+-------------------+------------------------+
|   10001 | 0007756-gyy66-4c6e-a59d-xxxccyyyt1 |       P           | 2020-03-02 00:00:08.785
|   10002 | 0007756-gyy66-4c6e-a59d-xxxccyyyt2 |       F           | 2020-04-06 00:00:08.785
|   10003 | 0007756-gyy66-4c6e-a59d-xxxccyyyt3 |       F           | 2020-04-01 00:01:08.785
|   10004 | 0007756-gyy66-4c6e-a59d-xxxccyyyt1 |       P           | 2020-05-02 00:02:08.785
|   10005 | 0007756-gyy66-4c6e-a59d-xxxccyyyt1 |       P           | 2020-05-09 00:03:08.785
|   10006 | 0007756-gyy66-4c6e-a59d-xxxccyyyt2 |       P           | 2020-05-09 01:00:08.785
|   10007 | 0007756-gyy66-4c6e-a59d-xxxccyyyt7 |       F           | 2020-06-06 02:00:08.785
+---------+------------------------------------+-------------------+------------------------+

每次發出新請求時，上表都會存儲請求 device_code、response_status 和請求時間。

我需要獲取包含兩個給定日期之間每一天的每個 device_code、total_trans、total_successful、total_failure 和日期的結果集。

我寫的查詢如下：

    SELECT DATE_FORMAT(aua.request_date,'%b') as month , 
    YEAR(aua.request_date) as year,
     DATE_FORMAT(aua.request_date,'%Y-%m-%d') as date,
    (select count(aua.audit_id) )as total_trans ,
    (select count(aua.audit_id) where aua.response_status  'P') as total_failure ,
    (select count(aua.audit_id) where aua.response_status = 'P') as total_successful ,
    aua.device_code as deviceCode
    FROM audit_webservice_aua aua where DATE_FORMAT(aua.request_date,'%Y-%m-%d') between '2020-04-16' and '2020-07-17' 
    group by dates,deviceCode ;

在上面的代碼中，我試圖獲得“2020-03-02”和“2020-06-06”之間的結果，但我得到的計數不正確。 任何幫助，將不勝感激。 先感謝您。

Answer 1

我認為您只需要條件聚合：

SELECT DATE_FORMAT(aua.request_date,'%b') as month , 
       YEAR(aua.request_date) as year,
       DATE_FORMAT(aua.request_date, '%Y-%m-%d') as date,
       COUNT(aua.audit_id) as total_trans ,
       SUM(aua.response_status <> 'P') as total_failure,
       SUM(aua.response_status = 'P') as total_successful,
       aua.device_code as deviceCode
FROM audit_webservice_aua aua 
WHERE DATE_FORMAT(aua.request_date, '%Y-%m-%d') between '2020-04-16' and '2020-07-17' 
GROUP BY month, year, date, deviceCode ;

我還建議您將WHERE子句更改為：

WHERE aua.request_date >= '2020-04-16' AND
      aua.request_date >= '2020-07-18'