Databasen - NULL dates

Andy Armstrong andy at
Wed Oct 18 13:55:00 BST 2006

On 18 Oct 2006, at 13:17, Jurgen Pletinckx wrote:
> I can see where I would be interested in the difference between
> as-yet-unknown (will be filled in during one of the next rounds
> of data entry) and unknowable (won't ever be filled in, barring
> paradigm shift or policy change).

One NULL is never enough - just like undef :)

If you want to know the reason for nullness that could go in another  
column - or perhaps another table.

Andy Armstrong,

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