Question

 
Table name "events"

   
 user_id    event_type      Created
    123     Flash C log     25-Sep-16
    127     Client C log    25-Sep-16
    123     Flash C log     25-Sep-16
    126     Flash C log     25-Sep-16
    185     Monitor log     25-Sep-16
    146     Delete log      25-Sep-16
    173     Flash C log     26-Sep-16
    183     Client C log    26-Sep-16
    193     Flash C log     26-Sep-16
    204     Monitor log     27-Sep-16
    214     Delete log      27-Sep-16
    225     Flash C log     27-Sep-16

期待结果

Date       Flash C log   Client C log 
25-Sep-16      2               1 
26-Sep-16      2               1 
27-Sep-16      1               0

我的查询没有给出正确的结果;

SELECT COUNT (DISTINCT e.user_id) AS Flash,
         COUNT (DISTINCT et.user_id) AS Client,
         TO_CHAR (e.created) AS Date_created
    FROM events e INNER JOIN events et ON e.user_id = et.user_id
   WHERE     e.created BETWEEN '25-SEP-15' AND '27-SEP-15'
         AND e.event_type = 'Flash C log'
         AND et.event_type = 'Client C log'
GROUP BY TO_CHAR (e.created);

Answer 1

COUNT必须在单独的子查询中完成。这应该有用。

编辑：纠正了几个愚蠢的错误，包括一个小提琴答案。

SELECT DISTINCT E.created,F.flash,C.client
FROM events E
LEFT JOIN (
    SELECT created,COUNT(DISTINCT user_id) as flash
    FROM events
    WHERE event_type LIKE 'Flash C log'
    GROUP BY created
) F
ON F.created = E.created
LEFT JOIN (
    SELECT Created,COUNT(DISTINCT user_id) as client
    FROM events
    WHERE event_type LIKE 'Client C log'
    GROUP BY created
) C
ON C.created = E.created
WHERE E.created BETWEEN '2016-09-25' AND '2016-09-27'

Fiddle with results

构建mysql查询以计算同一表/行下的特定数据

1 个答案: