選擇最近日期

Question

SELECT     dbo.Team.ID, dbo.Team.Comment, dbo.Team.Date, dbo.TeamName.Name, dbo.Contacts.ContactName 
FROM       dbo.Team 
INNER JOIN dbo.TeamName ON dbo.Team.ID = dbo.TeamName.id 
INNER JOIN dbo.Contacts ON dbo.Team.ContactID = dbo.Contacts.ContactID   
WHERE      dbo.TeamName.idstatus = 'Active'

我正在嘗試以僅向我提供最近日期的記錄的方式來查詢它，但是卻很少引起混淆，因為我已經從3個表中提取數據了，不確定在這里如何使用MAX(date) 。

Answer 1

SELECT     dbo.Team.ID, dbo.Team.Comment, MAX(dbo.Team.Date) LatestDate, dbo.TeamName.Name, dbo.Contacts.ContactName 
FROM       dbo.Team 
INNER JOIN dbo.TeamName ON dbo.Team.ID = dbo.TeamName.id 
INNER JOIN dbo.Contacts ON dbo.Team.ContactID = dbo.Contacts.ContactID   
WHERE      dbo.TeamName.idstatus = 'Active'
GROUP BY   dbo.Team.ID, dbo.Team.Comment, dbo.TeamName.Name, dbo.Contacts.ContactName 

將MAXD​​ING（）函數添加到日期列，並按所有列與所有其他列分組，以獲取所有其他列中值組合的最新日期。

Answer 2

我假設您想按dbo.Team.Date進行過濾。

將您的WHERE子句更改為：

WHERE (dbo.TeamName.idstatus = 'Active') 
and (dbo.Team.Date=(select max(Date) from dbo.Team))

Answer 3

使用GroupBy並具有：

SELECT     dbo.Team.ID, dbo.Team.Comment, MAX(dbo.Team.Date), dbo.TeamName.Name,   dbo.Contacts.ContactName, 
FROM         dbo.Team 
INNER JOIN
dbo.TeamName ON dbo.Team.ID = dbo.TeamName.id 
INNER JOIN
dbo.Contacts ON dbo.Team.ContactID = dbo.Contacts.ContactID
WHERE     (dbo.TeamName.idstatus = 'Active')
GROUP BY dbo.Team.ID, dbo.Team.Comment, dbo.Team.Date, dbo.TeamName.Name, dbo.Contacts.ContactName
HAVING dbo.Team.Date = MAX(dbo.Team.Date)