分裂时为什么我一直保持0

Question

我有以下代码，总是得到0.00。我确定weight_score是一个实际数字。有人可以帮我格式化它，以便产生十进制数。使用SQL Server 2008，此代码位于视图中。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INT除以另一个INT，这导致INT被舍入为0.为每个INT添加一个小数来解决该问题。

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。