如何将 CASE WHEN 语句改进为同一行上的 return 结果

Question

目前正在处理来自 OpenEdge 进度数据库的一些 SQL 脚本。目前我正在尝试 return 根据事件是 Estimated 还是 Actual 计时。这可以通过列中的结果来识别。我得到的问题是数据的工作方式是它显示相同的 EveNumber 但在两行上（一条用于估计，一条用于实际）。我想将这些行合二为一。

我已经尝试了下面的代码，但这让我得到的结果仍然是两行。我尝试将 case when 也放入 Else 部分，但这没有用。下面是我的浓缩代码：

SELECT 

Event_0.EveNumber
, (CASE WHEN Object_0.ObjName = '818 Artwork typeset duration' THEN TemplateRunObject_0.TroValue ELSE NULL END) AS 'Actual'
, (CASE WHEN Object_0.ObjName = '818 Artwork Estimated typeset duration' THEN TemplateRunObject_0.TroValue ELSE NULL END) AS 'Estimated'

FROM 
SBS.PUB.Event Event_0
LEFT JOIN SBS.PUB.TemplateRunObject TemplateRunObject_0 ON Event_0.TemplateRunID = TemplateRunObject_0.TemplateRunID 
JOIN SBS.PUB.Object Object_0 ON TemplateRunObject_0.ObjectId = Object_0.ObjectId

原始数据布局

Evenumber             Ogjname                              TroValue
123          818 Artwork typeset duration                     15
123          818 Artwork Estimated typeset duration           30

目前的结果是这样的：

EveNumber          Actual          Estimated
123                 15                0
123                  0                30

我希望他们如何出现

EveNumber          Actual          Estimated
123                 15                30

Answer 1

使用max()并按

分组

SELECT 

Event_0.EveNumber
, max((CASE WHEN Object_0.ObjName = '818 Artwork typeset duration' THEN TemplateRunObject_0.TroValue ELSE NULL END) ) AS 'Actual'
,max( (CASE WHEN Object_0.ObjName = '818 Artwork Estimated typeset duration' THEN TemplateRunObject_0.TroValue ELSE NULL END) )AS 'Estimated'

FROM 
SBS.PUB.Event Event_0
LEFT JOIN SBS.PUB.TemplateRunObject TemplateRunObject_0 ON Event_0.TemplateRunID = TemplateRunObject_0.TemplateRunID 
JOIN SBS.PUB.Object Object_0 ON TemplateRunObject_0.ObjectId = Object_0.ObjectId
group by  Event_0.EveNumber

Answer 2

对你有帮助；最大（）函数。但是你应该忘记 GROUP BY。

   SELECT Event_0.EveNumber
    , (MAX(CASE WHEN Object_0.ObjName = '818 Artwork typeset duration' THEN TemplateRunObject_0.TroValue ELSE NULL END)) AS 'Actual'
    , (MAX(CASE WHEN Object_0.ObjName = '818 Artwork Estimated typeset duration' THEN TemplateRunObject_0.TroValue ELSE NULL END)) AS 'Estimated'
    FROM 
    SBS.PUB.Event Event_0
    LEFT JOIN SBS.PUB.TemplateRunObject TemplateRunObject_0 ON Event_0.TemplateRunID = TemplateRunObject_0.TemplateRunID 
    JOIN SBS.PUB.Object Object_0 ON TemplateRunObject_0.ObjectId = Object_0.ObjectId
    GROUP BY Event_0.EveNumber

如何将 CASE WHEN 语句改进为同一行上的 return 结果

How to improve CASE WHEN statement to return result on same line

sql

excel

openedge

progress-db

ms-query