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

The result I get looks like an integer 1,2 etc

Answer 1

Try changing 16 to 16.0

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

You are seeing strange results because it is treating the results of your division as an integer rather than a decimal. Specifying the .0 tells sql server to treat it as a decimal.

UPDATE:

If the trailing zero's are freaking you out you can always do this:

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

Answer 2

The problem is this:

WeightInOZ / 16

Since you're dealing with two integers, SQL Server truncates the remainder, so by there's no fractional component for it to round.

What you want to do is force it to perform floating-point (or decimal) division. The easiest way would be to change 16 to 16.0 .

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