为什么我在分割时总是得到0

Question

我有以下总是导致0.00的代码片段。我确定weight_score是一个实际的数字。有人可以帮我格式化它，结果是十进制数。使用SQL Server 2008和此代码在视图中。非常感谢！

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

Answer 1

45/100被隐式视为INT由另一INT，这导致被四舍五入为0十进制添加到每个变通，一个INT划分。

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

如果你想避免的错误，你可以使用NULLIF功能。