Tsql 具有InnerJoin的最新日期的T-SQL子查询

我想做一件类似的事情，比如这个家伙：

我必须用n:m关系来做这件事

因此，布局是：

tbl_Opportunity
tbl_Opportunity_tbl_OpportunityData
tbl_OpportunityData

如您所见，有一个连接opportunity和opportunitydata的交叉表。 对于每个opportunity，都有多个opportunity数据。在我看来，我只想要一份包含所有Opportunite和最新opportunity数据的列表

我试过这样的方法：

SELECT     
    dbo.tbl_Opportunity.Id, dbo.tbl_Opportunity.Subject, 
    dbo.tbl_User.UserName AS Responsible, dbo.tbl_Contact.Name AS Customer, 
    dbo.tbl_Opportunity.CreationDate, dbo.tbl_Opportunity.ActionDate AS [Planned Closure], 
    dbo.tbl_OpportunityData.Volume, 
    dbo.tbl_OpportunityData.ChangeDate, dbo.tbl_OpportunityData.Chance
FROM         
    dbo.tbl_Opportunity 
INNER JOIN
    dbo.tbl_User ON dbo.tbl_Opportunity.Creator = dbo.tbl_User.Id 
INNER JOIN
    dbo.tbl_Contact ON dbo.tbl_Opportunity.Customer = dbo.tbl_Contact.Id 
INNER JOIN
    dbo.tbl_Opprtnty_tbl_OpprtnityData ON dbo.tbl_Opportunity.Id = dbo.tbl_Opprtnty_tbl_OpprtnityData.Id 
INNER JOIN
    dbo.tbl_OpportunityData ON dbo.tbl_Opprtnty_tbl_OpprtnityData.Id2 = dbo.tbl_OpportunityData.Id

SELECT * FROM (
    SELECT     dbo.tbl_Opportunity.Id, dbo.tbl_Opportunity.Subject, dbo.tbl_User.UserName AS Responsible, dbo.tbl_Contact.Name AS Customer, 
                      dbo.tbl_Opportunity.CreationDate, dbo.tbl_Opportunity.ActionDate AS [Planned Closure], dbo.tbl_OpportunityData.Volume, 
                      dbo.tbl_OpportunityData.ChangeDate, dbo.tbl_OpportunityData.Chance,
                      ROW_NUMBER() OVER (PARTITION BY dbo.tbl_Opportunity.Id ORDER BY dbo.tbl_OpportunityData.ChangeDate DESC) RN
    FROM         dbo.tbl_Opportunity INNER JOIN
                      dbo.tbl_User ON dbo.tbl_Opportunity.Creator = dbo.tbl_User.Id INNER JOIN
                      dbo.tbl_Contact ON dbo.tbl_Opportunity.Customer = dbo.tbl_Contact.Id INNER JOIN
                      dbo.tbl_Opprtnty_tbl_OpprtnityData ON dbo.tbl_Opportunity.Id = dbo.tbl_Opprtnty_tbl_OpprtnityData.Id INNER JOIN
                      dbo.tbl_OpportunityData ON dbo.tbl_Opprtnty_tbl_OpprtnityData.Id2 = dbo.tbl_OpportunityData.Id    
) AS Base WHERE RN = 1

问题是我的视图现在包含了每个opportunity数据的一行，因为我不知道如何筛选我只想要最新的数据

你能帮我吗？我的问题描述清楚吗

提前感谢：-） 最美好的祝福， 劳林

为了使它更具可读性，我使用了CTE（带部件）。最后，真正的“诀窍”是使用

ROW\u NUMBER（）

按

tbl\u Opportunity.Id

对数据进行分区，并按

ChangeDate DESC

对分区进行排序（我称之为

RN

）。显然，每个分区中的最大日期将是

RN=1

，然后我们通过

RN

对其进行过滤

如果不使用CTE，它将是这样的：

SELECT     
    dbo.tbl_Opportunity.Id, dbo.tbl_Opportunity.Subject, 
    dbo.tbl_User.UserName AS Responsible, dbo.tbl_Contact.Name AS Customer, 
    dbo.tbl_Opportunity.CreationDate, dbo.tbl_Opportunity.ActionDate AS [Planned Closure], 
    dbo.tbl_OpportunityData.Volume, 
    dbo.tbl_OpportunityData.ChangeDate, dbo.tbl_OpportunityData.Chance
FROM         
    dbo.tbl_Opportunity 
INNER JOIN
    dbo.tbl_User ON dbo.tbl_Opportunity.Creator = dbo.tbl_User.Id 
INNER JOIN
    dbo.tbl_Contact ON dbo.tbl_Opportunity.Customer = dbo.tbl_Contact.Id 
INNER JOIN
    dbo.tbl_Opprtnty_tbl_OpprtnityData ON dbo.tbl_Opportunity.Id = dbo.tbl_Opprtnty_tbl_OpprtnityData.Id 
INNER JOIN
    dbo.tbl_OpportunityData ON dbo.tbl_Opprtnty_tbl_OpprtnityData.Id2 = dbo.tbl_OpportunityData.Id

SELECT * FROM (
    SELECT     dbo.tbl_Opportunity.Id, dbo.tbl_Opportunity.Subject, dbo.tbl_User.UserName AS Responsible, dbo.tbl_Contact.Name AS Customer, 
                      dbo.tbl_Opportunity.CreationDate, dbo.tbl_Opportunity.ActionDate AS [Planned Closure], dbo.tbl_OpportunityData.Volume, 
                      dbo.tbl_OpportunityData.ChangeDate, dbo.tbl_OpportunityData.Chance,
                      ROW_NUMBER() OVER (PARTITION BY dbo.tbl_Opportunity.Id ORDER BY dbo.tbl_OpportunityData.ChangeDate DESC) RN
    FROM         dbo.tbl_Opportunity INNER JOIN
                      dbo.tbl_User ON dbo.tbl_Opportunity.Creator = dbo.tbl_User.Id INNER JOIN
                      dbo.tbl_Contact ON dbo.tbl_Opportunity.Customer = dbo.tbl_Contact.Id INNER JOIN
                      dbo.tbl_Opprtnty_tbl_OpprtnityData ON dbo.tbl_Opportunity.Id = dbo.tbl_Opprtnty_tbl_OpprtnityData.Id INNER JOIN
                      dbo.tbl_OpportunityData ON dbo.tbl_Opprtnty_tbl_OpprtnityData.Id2 = dbo.tbl_OpportunityData.Id    
) AS Base WHERE RN = 1

---

该语句可以进一步简化：

SELECT TOP 1 WITH TIES
    dbo.tbl_Opportunity.Id, dbo.tbl_Opportunity.Subject, dbo.tbl_User.UserName AS Responsible, 
    dbo.tbl_Contact.Name AS Customer, dbo.tbl_Opportunity.CreationDate, 
    dbo.tbl_Opportunity.ActionDate AS [Planned Closure], dbo.tbl_OpportunityData.Volume, 
    dbo.tbl_OpportunityData.ChangeDate, dbo.tbl_OpportunityData.Chance
FROM 
    dbo.tbl_Opportunity INNER JOIN
    dbo.tbl_User ON dbo.tbl_Opportunity.Creator = dbo.tbl_User.Id INNER JOIN
    dbo.tbl_Contact ON dbo.tbl_Opportunity.Customer = dbo.tbl_Contact.Id INNER JOIN
    dbo.tbl_Opprtnty_tbl_OpprtnityData ON dbo.tbl_Opportunity.Id = dbo.tbl_Opprtnty_tbl_OpprtnityData.Id INNER JOIN
    dbo.tbl_OpportunityData ON dbo.tbl_Opprtnty_tbl_OpprtnityData.Id2 = dbo.tbl_OpportunityData.Id    
ORDER BY 
    ROW_NUMBER() OVER (PARTITION BY dbo.tbl_Opportunity.Id ORDER BY dbo.tbl_OpportunityData.ChangeDate DESC);

---

我强烈建议使用有意义的表别名，使您的查询更具可读性！我现在完全知道你在做什么……但我印象深刻。它只是工作。我正在努力度过这段时间。也许我还有一些问题要问。但是你能告诉我：有没有一种方法可以在不输出RN的情况下执行此操作？在最后的

SELECT

，而不是

SELECT*

中，您可以对所需的列执行

SELECT

。谢谢，这也很有效。我还有一个问题。我应该过滤掉tbl_Opportunity.m__object_state=0的项目。但是我不能让它工作。我应该在何处插入此where条款？