Databasen - NULL dates

[Jurgen Pletinckx]

| Well, let's say we have:
| 
| 1) As yet unknown, will possibly be known in the future (date 
| of death, 
| employee resgination)
| 
| 2) Unknowable (end of the universe)
| 
| If something falls into category 2 then why model it at all? It is a

| constant.

Perhaps unknowable was the wrong word. Unknown, then? As in "We know 
this happened, but can't possibly assign a correct date" for fields 
where a unambiguous date was assumed, such as blood sample collection.

(Anecdote omitted - I'm sure everyone has horror stories.)

-- 
Jurgen Pletinckx
AlgoNomics NV