Microsoft Licensing methods for SQL Server is always a mystery! Though visiting HOWTOBUY says what type of license choose but nothing much to understand. Scalable link explains bit more than that page. Still I have to search for a quest on how many processor
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As it sounds this is an interview question, but if you look at the logical level of nothing much changes. There are two major concerns using such way, Performance and Storage space. In this using fixed char fields can be queried faster than varchar fields.
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