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Use NULL for unknown data...

Submitted by tkyte on Thu, 2009-10-22 14:04

Hah, it goes back much further than I thought... Snopes.com pointed out this morning that the use of a 'bad default value' dates back to at least 1979...

See http://tkyte.blogspot.com/2009/10/back-from-oracle-openworld.html for the original reference.