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[Date: 2001-04-01 to 2001-05-01]
From an RDBMS perspective, nullable columns in your primary key are pretty gackish, even if the particular database _does_ support it. You're saying "I need this thing to be able to uniquely identify an entity, but it's OK if it isn't there." That gives me quite a bit of cognitive dissonance 8^})
-- http://www.kpi.com.au/jawsarchive/0006/0098.html
-- http://www.kpi.com.au/jawsarchive/0006/0098.html
