SQL「分區」檢查工作不正常

Question

我的下面的查詢工作正常，它根據最新的掃描將新產品註冊到不同的位置。

我的問題是，有時我收到的產品具有相同的ID（這實際上是可能的）。 在我的波紋管表中，通常當產品到達位置5這意味着它已完成，並且當新產品獲得註冊時，它始終始於位置1。 正如你可以看到下面我再次得到了產品「2222」，我想我的下面「FirstScanned」檢索2222'，1，'2017-05-17 15:58而不是2222'，1 「2017年3月21日09:50

,min(p.Scanned) over (partition by p.ProductNR) as FirstScanned 

表：

CREATE TABLE Products 
(
    ProductNR varchar (14), 
    Location int, 
    Scanned Datetime 
); 
Insert Into Products(ProductNR, Location, Scanned) 
Values('1111', 1, '2017-03-15 09:30'), 
    ('1111', 2, '2017-03-16 11:35'), 
    ('1111', 3, '2017-03-21 12:37'), 
    ('2222', 1, '2017-03-21 09:50'), 
    ('2222', 5, '2017-03-21 12:58'); 
    ('2222', 1, '2017-05-17 15:58'); 

和查詢

select p.ProductNR, p.Location, p.Scanned 
    ,case 
     when p.FirstScanned >= dateadd(day, -5, getdate()) then 'Less than 5 days old' 
     when p.FirstScanned <= dateadd(day, -5, getdate()) then 'More than 5 days old' 
     else '0' 
    end as Age 
from 
(
    select p.ProductNR 
     ,p.Location 
     ,p.Scanned 
     ,min(p.Scanned) over (partition by p.ProductNR) as FirstScanned 
     ,max(p.Scanned) over (partition by p.ProductNR) as LastScanned 
    from Products p 
) p 
where p.LastScanned = p.Scanned 

Answer 1

; WITH p1 AS (
    SELECT p.ProductNR 
     ,p.Location 
     ,p.Scanned 
    FROM #Products p 
    WHERE p.Location <> 5 
) 
, p2 AS (
    SELECT p2.ProductNR 
     ,p2.Location 
     ,p2.Scanned 
     ,min(p2.Scanned) OVER (PARTITION BY p2.ProductNR) AS FirstScanned 
     ,max(p2.Scanned) OVER (PARTITION BY p2.ProductNR) AS LastScanned 
    FROM p1 p2 
) 

SELECT p3.ProductNR 
    , p3.Location 
    , p3.Scanned 
    , CASE 
     WHEN p3.FirstScanned >= dateadd(day, -5, getdate()) THEN 'Less than 5 days old' 
     WHEN p3.FirstScanned <= dateadd(day, -5, getdate()) THEN 'More than 5 days old' 
     ELSE '0' 
    END AS Age 
FROM p2 p3 
WHERE p3.LastScanned = p3.Scanned