選擇分區中的最小ID-MSSQL T-SQL

Question

我想選擇一個分區的最小ID。 有點像density_rank的工作方式，我想要一個與每個分區有關的唯一數字，但我希望該數字成為分區中的最小主鍵。 這是我所追求的一個例子。

USE AdventureWorks2012;  
GO  
SELECT '276 or 289 depending on what partition' as 'Min_BusinessEntityID'
  ,s.BusinessEntityID
  ,p.LastName
  ,s.SalesYTD
  ,a.PostalCode
 FROM Sales.SalesPerson AS s   
INNER JOIN Person.Person AS p   
    ON s.BusinessEntityID = p.BusinessEntityID  
INNER JOIN Person.Address AS a   
    ON a.AddressID = p.BusinessEntityID  
WHERE TerritoryID IS NOT NULL   
AND SalesYTD <> 0  
ORDER BY PostalCode, SalesYTD DESC

結果集示例

Answer 1

SQL Server MIN命令接受OVER（）子句：

SELECT MIN(s.BusinessEntityID) OVER (PARTITION BY TerritoryID) AS Min_BusinessEntityID
FROM ...