Float return

When the table below is created -the data selected
is different for values > 10. Does some one know why
float behaves this way ? - I am stumped
create table tempdb.dbo.TestValue (ColId int, TheValue
Float)
Insert into TestValue Values (1, 10.25)
Insert into TestValue Values (2, 10.99)
Insert into TestValue Values (3, 9.9)
Insert into TestValue Values (4, 6.59)
select * from TestValue
Results:
========
1 10.25
2 10.99
3 9.9000000000000004
4 6.5899999999999999PBrent
Read up "float and real" chapter in the BOL as well as visit on Aaron's web
site www.aspfaq.com to get more info and examples whu this datatype behaves
this way.
"PBrent" <PBrent@.discussions.microsoft.com> wrote in message
news:23d001c53f65$e8aff6a0$a401280a@.phx.gbl...
> When the table below is created -the data selected
> is different for values > 10. Does some one know why
> float behaves this way ? - I am stumped
> create table tempdb.dbo.TestValue (ColId int, TheValue
> Float)
> Insert into TestValue Values (1, 10.25)
> Insert into TestValue Values (2, 10.99)
> Insert into TestValue Values (3, 9.9)
> Insert into TestValue Values (4, 6.59)
> select * from TestValue
> Results:
> ========
> 1 10.25
> 2 10.99
> 3 9.9000000000000004
> 4 6.5899999999999999|||It's nothing special about 10. If you insert the values 16.9 into a float,
the actual floating-point value stored is just under 16.9, and you get this
Insert into TestValue Values (5, 16.9)
...
16.899999999999999
Of the numbers you inserted into the table, only 10.25 can be
stored exactly as a float. The others are stored as the nearest
representable floating-point value. When these approximations
are converted back to decimals for display, sometimes you see
the difference from the original number you tried to enter, and
sometimes you are lucky and they are rounded back to the
number you started with.
Steve Kass
Drew University
PBrent wrote:

>When the table below is created -the data selected
>is different for values > 10. Does some one know why
>float behaves this way ? - I am stumped
>create table tempdb.dbo.TestValue (ColId int, TheValue
>Float)
>Insert into TestValue Values (1, 10.25)
>Insert into TestValue Values (2, 10.99)
>Insert into TestValue Values (3, 9.9)
>Insert into TestValue Values (4, 6.59)
>select * from TestValue
>Results:
>========
>1 10.25
>2 10.99
>3 9.9000000000000004
>4 6.5899999999999999
>