Re: Best data type to use for sales tax percent

On 2009-10-09, Peter Eisentraut <peter_e@gmx.net> wrote:
> On Fri, 2009-10-09 at 11:46 -0700, Christophe Pettus wrote:
>> Domains are basically type aliases with an optional CHECK clause, so
>> you could do something like:
>>
>>     CREATE DOMAN sales_tax_rate AS DECIMAL(5,5) CHECK (VALUE >= 0);
>>
>> Then, you can use the type "sales_tax_rate" in your tables, etc. just
>> as a normal first-class type.  (The only limitation, right now, is
>> that you can't create an array of them.)
>
> Actually I wouldn't bother with the precision and scale at all.  I'd go
> with something like
>
> CREATE DOMAN sales_tax_rate AS DECIMAL CHECK (VALUE >= 0 AND VALUE <=1);

why the latter check ( VALUE <=1 )?