Why casting from float to varchar is being rounded in SQL Server

Question

Following sql

declare @a as float, @b as float

select @a=1.353954 , @b=1.353956
select 
CAST(@a as VARCHAR(40)) AS a_float_to_varchar ,
CAST(@b as VARCHAR(4         


        

Answer 1

Also from your link (it's actually the first line):

Approximate-number data types...

If you want exact precision, don't use float.

That being said, there is a function STR() specifically for converting float to a character data type.