Well variable is defined at creation time, see char() and varchar().
text data type is truely variable. pg_attribute.atttypmod has info
about the lenght.
---------------------------------------------------------------------------
Moritz Sinn wrote:
>
> hi,
>
> i'd like to write a datatype which is similar to varchar, i want the
> programmer be able to set its length when he creates the table. but
> it seems that there are only 2 options: completely variable or fixed.
> so do i have to write an new basic type and recompile postgresql?
>
> thanks,
> moritz
>
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