Question

目前我查询我的数据库以查找特定日期参数内的所有交互。我还将我的InteractionAttendees加入该表，然后通过TargetGroups表加入它。 InteractionAttendees告诉我谁参加了互动，TargetGroup告诉我这个人，他们是否是目标群体的一部分，如土着或法语。

我在设置原住民和法语国家专栏时遇到了麻烦。如果TargetGroup表中有任何与会者，我想将其设置为true。

select CONVERT(date, getdate()) as ActivityDate, 
       CASE when Type = 0 Then 'General' 
       when Type = 1 Then 'Activity' 
       else 'Task' End as Type, 

       CASE when Indepth = 0 Then 'False' else 'True' End as Indepth, 

       Subject,

       Comments,

       'false' as Aboriginal,
       'false' as FrancoPhone,
       'false' as Female,
       'false' as Youth,
       'false' as Other

from Sarnia.dbo.Interactions as X 
full outer join sarnia.dbo.InteractionAttendees as Y on X.Id = Y.Interaction_Id
full outer join Sarnia.dbo.TargetGroups as Z on Y.Person_Id = Z.PersonId
where ActivityDate >= '2015-07-01' and ActivityDate <= '2015-09-30' 
group by ActivityDate, Type, Indepth, Created, subject, comments

例如

Interaction Table
Id
 1

Interaction Attendee Table
Id    InteractionId    PersonId
1          1               5
2          1              10

TargetGroups Table
Id    PersonId    TargetValue
1        5           Aboriginal
2       10           Francophone

所以我的结果表是

Activity Date    Aboriginal    Francophone
     ----           True            True

请问如何正确填充目标组列。

Answer 1

您可以像这样更新您的查询：以老式的方式进行透视。基于您之前的问题，我假设它是一个sql server DB。

   MAX(IIF(TargetValue = 'Aboriginal', 'True', 'False')) as Aboriginal,
   MAX(IIF(TargetValue = 'FrancoPhone', 'True', 'False')) as FrancoPhone

如果你有SQL Server 2008或更早版本，你可以使用类似这样的东西

MAX(CASE WHEN TargetValue = 'Aboriginal' THEN 'True' ELSE 'False' END) as Aboriginal,
MAX(CASE WHEN TargetValue = 'FrancoPhone' THEN 'True' ELSE 'False' END) as FrancoPhone

Answer 2

以下是如何使用CTE执行此操作的示例。注意，我将此添加到您给出的示例sql中，但该sql有很多错误。

with igroup as
(
   SELECT IID,
         CASE WHEN ACOUNT > 0 THEN true ELSE false END AS Aboriginal,
         CASE WHEN FCOUNT > 0 THEN true ELSE false END AS Francophone
   FROM (

     SELECT InteractionId as IID,
          SUM(CASE WHEN TargetValue = 'Aboriginal' THEN 1 ELSE 0 END) as ACOUNT,
          SUM(CASE WHEN TargetValue = 'FrancoPhone' THEN 1 ELSE 0 END) as FCOUNT
     FROM sarnia.dbo.InteractionAttendees A
     LEFT JOIN sarnia.dbo.TargetGroups as G on A.Person_Id = G.PersonId
     GROUP BY InteractionId
   ) X
)
select CONVERT(date, getdate()) as ActivityDate, 
       CASE when Type = 0 Then 'General' 
       when Type = 1 Then 'Activity' 
       else 'Task' End as Type, 

       CASE when Indepth = 0 Then 'False' else 'True' End as Indepth, 

       Subject,

       Comments,

       igroup.Aboriginal,
       igroup.FrancoPhone,

from Sarnia.dbo.Interactions as X 
full outer join sarnia.dbo.InteractionAttendees as Y on X.Id = Y.Interaction_Id
join igroup on X.Id = igroup.IID
where ActivityDate >= '2015-07-01' and ActivityDate <= '2015-09-30' 
group by ActivityDate, Type, Indepth, Created, subject, comments

select for strings中的条件语句

2 个答案: