SQL IsNumeric not working

Question

The reserve column is a varchar, to perform sums on it I want to cast it to a deciaml. But the SQL below gives me an error

select
cast(Reserve as decimal)
fr         


        

Answer 1

It seems that isnumeric has some Problems:

http://www.sqlhacks.com/Retrieve/Isnumeric-problems (via internet archive)

According to that Link you can solve it like that:

select
cast(Reserve as decimal)
from MyReserves
where MyReserves is not null
and MyReserves * 1 = MyReserves