Databasen - NULL dates
paul at pjcj.net
Wed Oct 18 17:29:43 BST 2006
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
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