Question

我很少使用SQL而且我遇到了这项任务的麻烦。该表包含了我需要的所有信息。

一个人可以请求访问建筑物的某个部门，因此可能需要两种类型的认可。

我必须发现有关用户为其有权访问的每个建筑物所做的第一个请求的数据

如果用户Jon请求访问扇区“A”，2周后访问扇区“B”，我只需要返回有关谁批准了部门的“A”和何时。

我可以找出首先请求的扇区和日期。但我不知道如何归还批准者，因为他们在另一个批准者行。我认为这里的关键是使用票号。

记录

ID  EVENTDATE   TICKET  USER    ACTION  EVENT   APPROVER    BUILDING    SECTOR  STATUS
15  7/1/2015 12:25  17C9F862    4003321 New access request  Started -   OHIO    IT_2    Running
14  7/1/2015 12:41  17C9F862    4003321 Approved    Manager approval    4001719 OHIO    IT_2    Running
12  7/1/2015 15:29  17C9F862    4003321 -   Finished    -   OHIO    IT_2    Finished: Approved
13  7/1/2015 15:29  17C9F862    4003321 Approved    Director Approval   4003468 OHIO    IT_2    Running
10  7/1/2015 20:57  897B9A0A    4003321 New access request  Started -   OHIO    DEVELOPMENT Running
11  7/1/2015 20:57  F3DCFB96    4003321 New access request  Started -   OHIO    INFRA_2 Running
9   7/1/2015 20:58  897B9A0A    4003321 Approved    Manager approval    4001719 OHIO    DEVELOPMENT Running
8   7/1/2015 20:58  F3DCFB96    4003321 Approved    Manager approval    4001719 OHIO    INFRA_2 Running
7   7/1/2015 21:01  F3DCFB96    4003321 Approved    Director Approval   4001547 OHIO    INFRA_2 Running
6   7/1/2015 21:01  F3DCFB96    4003321 -   Finished    -   OHIO    INFRA_2 Finished: Approved
4   7/1/2015 21:03  897B9A0A    4003321 -   Finished    -   OHIO    DEVELOPMENT Finished: Approved
5   7/1/2015 21:03  897B9A0A    4003321 Approved    Director Approval   4001549 OHIO    DEVELOPMENT Running
3   7/1/2015 21:22  3E18483E    4003321 Approval not needed Finished    -   OHIO    IT_1    Finished: Approved
2   7/2/2015 9:48   F902EB9C    4003321 Approval not needed Finished    -   UTAH    FINANCE Finished: Approved
1   7/2/2015 11:08  C186101C    4003321 Approval not needed Finished    -   OHIO    INFRA_1 Finished: Approved

期望的结果：

USER    Manager Approver    Director Approver   BUILDING    SECTOR  DATE
4003321 4001719 4003468 OHIO    IT_2    7/1/2015 15:29
4003321 -   -   UTAH    FINANCE 7/2/2015 9:48

使用SQL

SELECT SEL.USER
     , SEL.BUILDING
     , SEL.SECTOR
     , SEL.EVENTDATE
     , SEL.TICKET 
FROM ACCESSREQUESTS SEL 
INNER JOIN 
         (
          SELECT USER
               , BUILDING
               , SECTOR
               , MIN(EVENTDATE) as data 
         FROM ACCESSREQUESTS 
         WHERE EVENT = 'Finished' 
           AND STATUS = 'Finished: Approved' 
           AND USER != 'null' 
         GROUP BY USER
                , BUILDING
                , SECTOR 
         ORDER BY USER
        ) RE ON RE.DATA = SEL.EVENTDATE 
            AND SEL.STATUS = 'Finished: Approved'

Answer 1

抱歉，我无法从您的示例数据中确切地告诉我们哪一列的数据已经结束，而下一个列已经开始，所以我可能会有一些列错误，但请尝试添加：

left join (select 
    ticket
    , approver 
from accessrequests 
where event = 'Approved  Director Approval') as Director_Approval 
on Director_Approval.ticket = sel.ticket

left join (select 
    ticket
    , approver 
from accessrequests 
where event = 'Approved  Manager Approval') as Manager_Approval 
on Manager_Approval.ticket = sel.ticket

然后在你的选择中添加只需添加

isnull(Manager_approval.approver,'') as Manager_approver,
isnull(Director_approval.approver,'') as director_approver

你可能需要将它添加到你的子查询中，但是这应该指向正确的方向：）

SQL：返回访问请求的第一个实例

1 个答案: