Question

I have a problem when i’m trying to calculate in a view a formula whose result is smaller than 1.
e.g. I have the next formula: Arenda*TotalArea/10000 as TotalArenda
If I have Arenda=10 and TotalArea=10 I get TotalArenda=0,00 when normally should be 0.01
Thanks

Answer 1

Make Arenda = 10.0 and TotalArea = 10.0 instead of 10 and 10. This will force SQL not to use integer math and you will get your needed accuracy.

In fact, the only way I can get 0.0 as the result is if the Arenda is 10 (integer) while at least one of TotalArea or 10000 contain a decimal and a trailing 0, and only if I override order of operations by grouping using parentheses such as

select 10.0* (10/10000) as blah

If all are integers you get 0. If all contain decimals you get 0.01. If I remove the parentheses, I get 0.01 if ANY of them are non-integer types.

If precision is highly important I would recommend you cast to decimals and not floats:

select CONVERT(decimal(10,2), Arenda) * CONVERT(decimal(10,2), TotalArea) / 10000.0