sql - 为什么除法的时候一直是0

Question

我有以下代码总是导致 0.00。我确定 weight_score 是一个实际数字。有人可以帮我格式化它，以便它产生一个十进制数。使用 SQL Server 2008，此代码在视图中。非常感谢！

CAST(SUM(weight_score * (45/100)) as decimal(10,2)) As avg_score

Answer 1

45/100 被隐含地视为一个 INT 除以另一个 INT，这导致一个 INT 四舍五入为 0。为每个 INT 添加一个小数以解决该问题。

CAST(SUM(weight_score * (45.0/100.0)) as decimal(10,2)) As avg_score

Answer 2

 45/100 is treated as INT.So change it to 45.0/100.0. 
 select CAST(SUM(weight_score * (45.0/100.0)) as decimal(10,2)) As avg_score

 Even if you write the following code you will get 0
 select (45/100)

Answer 3

如果要避免错误，可以使用 NULLIF 函数。