如何让计算出的 SQL 服务器百分比值只显示两位小数？

Question

我有这个 TSQL：

CREATE TABLE #TEMPCOMBINED(
  DESCRIPTION VARCHAR(200),
  WEEK1USAGE DECIMAL(18,2),
  WEEK2USAGE DECIMAL(18,2),
  USAGEVARIANCE AS WEEK2USAGE - WEEK1USAGE,
  WEEK1PRICE DECIMAL(18,2),
  WEEK2PRICE DECIMAL(18,2),
  PRICEVARIANCE AS WEEK2PRICE - WEEK1PRICE,
  PRICEVARIANCEPERCENTAGE AS (WEEK2PRICE - WEEK1PRICE) / NULLIF(WEEK1PRICE,0)
);

INSERT INTO #TEMPCOMBINED (DESCRIPTION, 
WEEK1USAGE, WEEK2USAGE, WEEK1PRICE, WEEK2PRICE)
SELECT T1.DESCRIPTION, T1.WEEK1USAGE, T2.WEEK2USAGE, 
T1.WEEK1PRICE, T2.WEEK2PRICE
FROM #TEMP1 T1
LEFT JOIN #TEMP2 T2 ON T1.MEMBERITEMCODE = T2.MEMBERITEMCODE

...按我的意愿工作（显示 "Usage" 和 "Price" 列有两位小数的值）除了计算的百分比值 (PRICEVARIANCEPERCENTAGE) 显示的值比 Cyrano de 长Bergerac的鼻子，比如“0.0252707581227436823”

如何强制将其改为“0.03”（等等）？

Answer 1

使用 ROUND 函数

SELECT ROUND(column_name,decimals) FROM table_name;

Answer 2

尝试在创建 table 时显式转换计算列，如下所示：

CREATE TABLE #TEMPCOMBINED(
  DESCRIPTION VARCHAR(200),
  WEEK1USAGE DECIMAL(18,2),
  WEEK2USAGE DECIMAL(18,2),
  USAGEVARIANCE AS WEEK2USAGE - WEEK1USAGE,
  WEEK1PRICE DECIMAL(18,2),
  WEEK2PRICE DECIMAL(18,2),
  PRICEVARIANCE AS WEEK2PRICE - WEEK1PRICE,
  PRICEVARIANCEPERCENTAGE AS CAST((WEEK2PRICE - WEEK1PRICE) / NULLIF(WEEK1PRICE,0) AS DECIMAL(18,2))

);

Answer 3

使用 ROUND() 函数。看看here and here

如何让计算出的 SQL 服务器百分比值只显示两位小数？

How can I get my calculated SQL Server percentage value to only display two decimals?

sql

tsql

precision

decimal-precision