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a problem about database modeling

From: dxuranus <dxuranus_at_gmail.com>
Date: 17 Jul 2006 18:20:03 -0700
Message-ID: <1153185603.505008.24930@s13g2000cwa.googlegroups.com>


  i have a entity 'device' and every 'device' has there own 'type' and every 'type' has there specific attributes.   first i let the table 'device' keep all common attributs of device ,but i find i can't keep the 'device's type attributes at least i found if i do that.it got be urgly and strangly. so what can i do about this thanks for any help. Received on Mon Jul 17 2006 - 20:20:03 CDT

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