Question

我在SQL Server 2012 DB中有以下数据表：

DATE          TICKER    PRICE
2015-09-25      A         10
2015-09-24      A         9
2015-09-23      A         8
2015-09-25      B         3
2015-09-24      B         4
2015-09-23      B         5

我想用sql查询选择以下值：

TICKER   VALUE
 A       1.25
 B       0.6

如果股票代码A的值为10/8（最新日期和特定日期，在此示例中为2015-09-23且应该可更改）。

股票代码B的值为3/5。

这就是我的尝试：

SELECT DISTINCT TICKER, 
ROUND(
((SELECT PRICE FROM INDICEPRICEHISTORY WHERE TICKER = 'A' AND EOD =  '2015-09-25') /
(SELECT PRICE FROM INDICEPRICEHISTORY WHERE TICKER = 'A' AND EOD = '2015-09-23')),2)
AS VALUE
FROM INDICEPRICEHISTORY

所以我至少需要做的是获得WHERE TICKER =＆＃39; A＆＃39;相对于所选的实际股票代码而言......并且EOD＆＃39; s（EOD = DATE）是可变的..

提前谢谢。

Answer 1

您可以使用CTE获取最后的价格，在您查找的日期加入价格：

;WITH
    LastPrice
    (
        SELECT      Ticker, Price,
                    RowNumber = ROW_NUMBER() OVER (PARTITION BY Ticker ORDER BY EOD DESC)
        FROM        INDICEPRICEHISTORY
    )

SELECT      I.Ticker,
            Value = L.Price / I.Price
FROM        INDICEPRICEHISTORY  I
INNER JOIN  LastPrice           L ON I.Ticker = L.Ticker
WHERE       I.EOD = '2015-09-23' AND L.RowNumber = 1

Answer 2

您可以使用first_value和last_value分别获取每个跟踪器的第一个和最后一个价格。从那以后，它只是数学：

SELECT DISTINCT [tracker], 
       LAST_VALUE([price]) OVER (PARTITION BY [tracker] 
                                 ORDER BY [date]
                                 ROWS BETWEEN UNBOUNDED PRECEDING AND
                                              UNBOUNDED FOLLOWING) /
       FIRST_VALUE([price]) OVER (PARTITION BY [tracker] 
                                  ORDER BY [date]  
                                  ROWS BETWEEN UNBOUNDED PRECEDING AND 
                                               UNBOUNDED FOLLOWING)
       AS [Growth]                                
FROM   mytable

<强> SQLFiddle

SQL计算数据表的增长百分比

2 个答案: