On Fri, Nov 03, 2006 at 02:03:59PM -0800, rloefgren@forethought.net wrote:
> You're right (I dug around in the documentation and edjoocated myself).
> However:
<snip>
> sales=# select 1/2::float;
> ?column?
> ----------
> 0.5
> (1 row)
Note that in this case the "float" cast only applies to the last
number. That's why you get this:
> sales=# select (1/2)*4::float;
> ?column?
> ----------
> 0
> (1 row)
The integer divide happens first. It is best to apply the cast to the
first element of the expression, as expressions are parsed
left-to-right, so:
select (1::float/2)::4;
Works better. However, mostly it's better to explicitly make all your
constants non-integer if that's what you mean. This statement:
select (1.0/2.0)*4.0;
Gives the same result, but doesn't need any casts.
Have a nice day,
--
Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/
> From each according to his ability. To each according to his ability to litigate.
