Question

我的以下查询工作正常，它根据最新扫描将新产品注册到不同的位置。

我的问题是，有时我会收到ID相同的产品（实际上是可能的）。在我的波纹管表中有位置，通常当产品达到位置5 时，意味着它已完成，当新产品注册时，它将始终从位置1开始。正如你在下面看到的，我得到了产品＆＃34; 2222＆＃34;再次，我想让我的下面＆＃34; FirstScanned＆＃34;检索 2222＆＃39;，1，＆＃39; 2017-05-17 15:58 而不是 2222＆＃39;，1，＆＃39; 2017-03-21 09 ：50

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

表格：

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');

和查询

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

SQL＆＃34;分区＆＃34;检查不正常

1 个答案: