当 SELECT 子句中存在 ISNULL 时如何舍入值中的小数？

Question

我在这个数据透视表中四舍五入小数点时遇到问题 table:

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代码如下：

SELECT P.LastName,  [Bike Racks]=ISNULL([Bike Racks],0), [Bottles and Cages]=ISNULL([Bottles and Cages],0), [Bottom Brackets]=ISNULL([Bottom Brackets],0), [Brakes]=ISNULL([Brakes],0)
FROM #TabPivot 
PIVOT (
SUM(Total)
FOR Name IN ( [Bike Racks], [Bottles and Cages], [Bottom Brackets], [Brakes])) AS P
ORDER BY P.LastName;

我尝试使用 ROUND 和 CAST...AS NUMERIC 函数，但没有用（也许我做错了什么）：

SELECT P.LastName,  ROUND([Bike Racks]=ISNULL([Bike Racks],0),2), ...

SELECT P.LastName,  ROUND(([Bike Racks]=ISNULL([Bike Racks],0)),2), ...

SELECT P.LastName,  ROUND(([Bike Racks]=ISNULL([Bike Racks],0), [Bottles and Cages]=ISNULL([Bottles and Cages],0), [Bottom Brackets]=ISNULL([Bottom Brackets],0), [Brakes]=ISNULL([Brakes],0)),2)

SELECT P.LastName,  CAST([Bike Racks]=ISNULL([Bike Racks],0) AS Numeric(15,2))

SELECT P.LastName,  CAST([Bike Racks]=ISNULL([Bike Racks],0)) AS Numeric(15,2)

你能帮帮我吗？

Answer 1

列名不能在函数内部，而是在函数外部，试试这个：

SELECT [Bike Racks] = cast(isnull(0.66666, 0)  as decimal(18,2))

作为替代方案，当您使用 AS 语法指定列名时可能会更清楚：

SELECT cast(isnull(0.66666, 0)  as decimal(18,2)) AS [Bike Racks]

Answer 2

您只需将数据转换为 十进制 数据类型并指定正确的 scale 和 precision.

例如

declare @v float=14
select @v/3.066, Cast(@v/3.066 as decimal (5,2))

Returns

4.5662100456621 4.57

Answer 3

试试这个：

Select Convert(Decimal (17,0),[Bike Racks]) AS [Bike Racks with convert]
      ,Floor(ISNULL([Bike Racks], 0)) AS [Bike Racks round down number]
      ,Ceiling(ISNULL([Bike Racks], 0)) AS [Bike Racks round to up number]

您可以在下面的示例中找到其他可用的圆形模型：

DECLARE @value decimal(10,2)
SET @value = 11.05

SELECT ROUND(@value, 1)  -- 11.10
SELECT ROUND(@value, -1) -- 10.00 

SELECT ROUND(@value, 2)  -- 11.05 
SELECT ROUND(@value, -2) -- 0.00 

SELECT ROUND(@value, 3)  -- 11.05
SELECT ROUND(@value, -3) -- 0.00

SELECT CEILING(@value)   -- 12 
SELECT FLOOR(@value)     -- 11

Reference

当 SELECT 子句中存在 ISNULL 时如何舍入值中的小数？

How to round off decimals in values when ISNULL exists in SELECT clause?

sql

tsql

sql-server

rounding