为什么我的T-SQL不能工作?

In my code, I need to test whether specified column is null and the most close to 0 as possible (it can holds numbers from 0 to 50) so I have tried the code below. It should start from 0 and for each value test the query. When @Results gets null, it should return. However, it does not work. Still prints 0.In my code, I need to test whether specified co