Question

我有一张价格变动表，我需要获得初始价格和最新价格。换句话说，我想为每个产品在一行中显示min（StartDate）和max（StartDate）的价格值。

表结构很简单：

ProductID, StartDate, Price

期望的结果是

ProductId, StartDate, InitialPrice, LatestDate, LatestPrice

Answer 1

WITH latestPrice AS
(
   SELECT ProductID, StartDate, Price,
          ROW_NUMBER() OVER (PArtition BY ProductID ORDER BY StartDate DESC) rn
   FROM TableName
)
, initalPrice AS
(
  SELECT ProductID, StartDate, Price,
         ROW_NUMBER() OVER (PArtition BY ProductID ORDER BY StartDate ASC) rn
  FROM TableName  
)
SELECT  a.ProductID,
        b.StartDate, 
        b.Price InitalPrice, 
        c.StartDate LatestDate, 
        c.Price LatestPrice
FROM    (SELECT DISTINCT ProductID FROM tableName) a
        INNER JOIN initalPrice b
          ON a.ProductID = b.ProductID AND b.rn = 1
        INNER JOIN latestprice c
          ON a.ProductID = c.ProductID AND c.rn = 1

SQLFiddle Demo

Answer 2

(SELECT x.ProductId, x.MinStartDate, x.MinPrice, y.MaxStartDate, y.MaxPrice FROM (SELECT a.ProductId, a.MinStartDate, b.Price AS MinPrice FROM (SELECT ProductId, MIN(StartDate) AS MinStartDate FROM Products GROUP BY ProductId) a INNER JOIN Products b ON a.ProductId = b.ProductId AND a.MinStartDate = b.StartDate) x INNER JOIN (SELECT a.ProductId, a.MaxStartDate, b.Price AS MaxPrice FROM (SELECT ProductId, MAX(StartDate) AS MaxStartDate FROM Products GROUP BY ProductId) a INNER JOIN Products b ON a.ProductId = b.ProductId AND a.MaxStartDate = b.StartDate) y ON x.ProductId = y.ProductId

免责声明：这是来自记忆，所以如果这不完全准确，我会道歉。并且它假定StartDate是日期时间或不是每个productId重复。

希望这会有所帮助。

一行中最小和最大行的SQL值

2 个答案: