Databasen - NULL dates

[Paul Johnson]

On Wed, Oct 18, 2006 at 01:55:00PM +0100, Andy Armstrong wrote:

> On 18 Oct 2006, at 13:17, Jurgen Pletinckx wrote:
> >
> >NULL and VERY NULL?
> 
> One NULL is never enough - just like undef :)

Hardware Description Languages use multi valued "boolean" logic types.
Verilog uses a four valued logic type, for example.  VHDL, nine.

-- 
Paul Johnson - paul at pjcj.net
http://www.pjcj.net