在多列的 1 行中顯示多條記錄

Question

我有一個存儲用戶信息的表，例如：

我需要編寫一個查詢，以下列格式返回結果：

我嘗試為每個狀態做一個LEFT JOIN但這沒有用，關於如何獲得預期結果的任何想法？

Answer 1

如果狀態數是固定的，你可以這樣做

Select 
    id user_id,
    open_status,
    open_status_date,
    inprogress_status,
    inprogress_status_date,
    complete_status,
    complete_status_date
from
    (select user_id id from yourTable group by user_id) U left join  
    (select user_id id, status open_status, status_date open_status_date 
     from yourTable where status = 'Open') O on U.id = O.id left join  
    (select user_id id, status inprogress_status, status_date inprogress_status_date 
     from yourTable where status = 'InProgress') P on U.id = P.id left join
    (select user_id id, status complete_status, status_date complete_status_date 
     from yourTable where status = 'Complete') C on U.id = C.id 
Order by id

闖入內聯視圖並加入。 但這可能不是最有效的方法。

另請注意：如果每個用戶肯定至少具有“打開”狀態，您可以跳過第一個U內聯視圖並以O開頭

Answer 2

您想使用樞軸，如下所示：

    select * from test
    PIVOT(
        max(status_date)
        FOR status
        IN ( 
            'Open',
            'In Progress',
            'Complete'
        )
    )
order by user_id

Answer 3

假設每個用戶都有“打開”狀態

With
 open as (select * from table where status = 'Open'),
 inp as (select * from table where status = 'In Progress'),
 comp as (select * from table where status = 'Complete')
select o.user_id,o.status open_status, o.status_date open_status_date,i.status InProgress_status, i.status_date InProgress_status_date,c.status complete_status, c.status_date complete_status_date
from open o, inp i, comp c
where o.user_id=i.user_id(+)
and o.user_id=c.user_id(+)