Question

我有以下SQL语句。我需要使用System.RevisedDate

为每个System.Id选择最新记录

SELECT     [System.Id],[System.RevisedDate], [System.Title], [System.State], [System.Reason], [System.CreatedDate], [System.WorkItemType], [System.TeamProject], 
                      [Microsoft.VSTS.Scheduling.RemainingWork], [Microsoft.VSTS.Scheduling.CompletedWork], [Microsoft.VSTS.CMMI.Estimate]
FROM         WorkItems
WHERE     ([System.WorkItemType] = 'Change Request') AND ([System.CreatedDate] >= '09/30/2008') AND ([System.TeamProject] NOT LIKE '%Deleted%') AND 
                      ([System.TeamProject] NOT LIKE '%Sandbox%')

你能帮忙吗？

Answer 1

试试这个：

SELECT * FROM WorkItems w
JOIN (
SELECT     [System.Id],MAX([System.RevisedDate])
FROM WorkItems
WHERE ([System.WorkItemType] = 'Change Request') 
AND ([System.CreatedDate] >= '09/30/2008') 
AND ([System.TeamProject] NOT LIKE '%Deleted%') 
AND ([System.TeamProject] NOT LIKE '%Sandbox%')
GROUP BY {System.Id]
) x ON w.[System.Id] = x.[System.Id] AND w.[System.DateRevised] = x.[System.DateRevised]

Answer 2

一般来说，它应该是像

这样的东西

SELECT ID,DATE_FIELD,FIELD1,FIELD2
FROM TBL1 AS A WHERE DATE_FIELD >= ALL (
   SELECT DATE_FIELD FROM TBL1 AS B
   WHERE A.ID = B.ID 
)

Answer 3

或，（使用子查询）

SELECT ID,DATE_FIELD,FIELD1,FIELD2
FROM TBL1 T
Where DATE_FIELD = 
    (Select Max(Date_Field) From Tbl1 
     Where Id = T.Id)

但我无法破译你的示例查询......“System”是一个表吗？为什么Select子句中没有对WorkItem的引用？它似乎没有在一起...... ...

Answer 4

尝试

SELECT [System.Id],[System.RevisedDate], [System.Title], [System.State], [System.Reason], [System.CreatedDate], [System.WorkItemType], [System.TeamProject], 
[Microsoft.VSTS.Scheduling.RemainingWork], [Microsoft.VSTS.Scheduling.CompletedWork], [Microsoft.VSTS.CMMI.Estimate]
FROM         WorkItems
Left JOIN (Select [System.Id],Max([System.RevisedDate]) group by [System.Id]) LatestItems
    on Workitems.[System.Id] = LatestItems.[System.Id] and 
    Workitems.[System.RevisedDate] = LatestItems.[System.RevisedDate]
    WHERE     
([System.WorkItemType] = 'Change Request') AND ([System.CreatedDate] >= '09/30/2008') AND ([System.TeamProject] NOT LIKE '%Deleted%') AND 
                          ([System.TeamProject] NOT LIKE '%Sandbox%')

Answer 5

我喜欢亚历克斯的回答，但我想我会投入另一种可能性。对不起，没有机会测试它。： - ）

SELECT     WorkItems.[System.Id], WorkItems.[System.RevisedDate], [System.Title], [System.State],     [System.Reason], [System.CreatedDate], [System.WorkItemType], [System.TeamProject], 
                  [Microsoft.VSTS.Scheduling.RemainingWork], [Microsoft.VSTS.Scheduling.CompletedWork], [Microsoft.VSTS.CMMI.Estimate]
FROM         WorkItems join (SELECT     [System.Id],max([System.RevisedDate]) [MaxDate]
                         FROM         WorkItems
                         WHERE     ([System.WorkItemType] = 'Change Request') AND ([System.CreatedDate] >= '09/30/2008') AND ([System.TeamProject] NOT LIKE '%Deleted%') AND 
                         ([System.TeamProject] NOT LIKE '%Sandbox%')
                         group by [System.Id]) MaxDates
on  WorkItems.[System.Id] = MaxDates.[System.Id]
and WorkItems.[System.RevisedDate] = MaxDates.[MaxDate]

SQL区别于ID和最新日期

5 个答案: