Question

我想使用sql创建一个表来复合兴趣。

name    rate    principal   year1   year2
A       .5      10          15       22.5
B       .0      10          10       10.0

我能够为每个名称创建一个存储过程并对其进行硬编码两年，但这意味着每增加一年我就要再添加一年。是否有一种优雅而有效的方法，可以使用过程或仅查看视图？

Answer 1

您似乎需要复利计算和支点。这是一个5年的静态版本，如果你需要让持续时间变得动态，有很多关于动态旋转的例子。

编辑：我忽略了SQL 2005标记 - 无法确认这将在该版本上运行，因为我们在此处使用SQL 2012/4。

CREATE TABLE #Test (
    Name CHAR(1),
    Rate MONEY,
    Principal MONEY
);

INSERT INTO #Test (Name, Rate, Principal)
VALUES  ('A', 0.5, 10),('B', 0, 10);


WITH Years AS (
 SELECT 1 Year
 UNION ALL 
 SELECT Year+1 FROM Years
 WHERE Year < 5
)
SELECT
     *
       FROM 
    (SELECT 'Year'+CAST(Year AS VARCHAR(1)) Year, 
        Name, 
        Rate, 
        Principal,   
        Principal * POWER((Rate+1), Year) Result
    FROM Years, #Test) A
PIVOT (MAX(RESULT) FOR YEAR IN ([Year1], [Year2], [Year3],[Year4],[Year5])) PVT


Name Rate                  Principal             Year1                 Year2                 Year3                 Year4                 Year5
---- --------------------- --------------------- --------------------- --------------------- --------------------- --------------------- ---------------------
A    0.50                  10.00                 15.00                 22.50                 33.75                 50.625                75.938
B    0.00                  10.00                 10.00                 10.00                 10.00                 10.00                 10.00

Answer 2

低于你想要的？

declare @NbrofYears int, @Rate float, @Principle float

select @NbrofYears = 5, @Principle = 10, @rate = 0.5

;with cte as
(
select 1 as NbrOfYears, @Principle as Principle, @Rate as Rate
union all
select NbrOfYears + 1, Principle * (1 + @Rate), Rate
from cte
where NbrOfYears < @NbrofYears
)

select * from cte

使用tsql复合年度兴趣

2 个答案: