Va recomand sa parcurgeti urmatorul articol al lui Bob Beauchemin pe tema EAV (Entity-attribute-value): http://www.sqlskills.com/BLOGS/BOBB/post/And-the-EAV-winner-is-sparse-columns.aspx
E posibil sa va dea o alta perspectiva.

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Cristian Andrei Lefter, SQL Server MVP
MCT, MCSA, MCDBA, MCAD, MCSD .NET,
MCTS, MCITP - Database Administrator SQL Server 2005
http://sqlserver.ro