Databasen - NULL dates

Jurgen Pletinckx jurgen.pletinckx at
Wed Oct 18 14:10:57 BST 2006

| 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  

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