SQL Server 2008:为什么这轮不能到两位小数？

Question

SELECT
   ROUND(WeightInOZ / 16, 2)as WeightInLbs
FROM
   Inventory

我得到的结果看起来像整数1,2等

Answer 1

尝试将16更改为16.0

SELECT
   ROUND(WeightInOZ / 16.0, 2)as WeightInLbs
FROM
   Inventory

您看到奇怪的结果,因为它将您的除法结果视为整数而不是小数.指定.0tell sql server将其视为小数.

更新:

如果尾随的零件吓到了你,你可以随时这样做:

SELECT
   CAST(ROUND(WeightInOZ / 16.0, 2) AS NUMERIC(8,2)) as WeightInLbs
FROM
   Inventory

Answer 2

问题是这样的:

WeightInOZ / 16

由于您正在处理两个整数,因此SQL Server会截断余数,因此没有用于舍入的小数组件.

你想要做的是强迫它执行浮点(或十进制)除法.最简单的方法是16改为16.0.

SELECT
   ROUND(WeightInOZ / 16.0, 2)as WeightInLbs
FROM
   Inventory