Database Design and Normalization
A nice and beginner's article for learning database design
A logical database is a collection of facts. Your company may have a personnel database wherein facts about its employees are kept. Your company may have an inventory database where it keeps facts about the numbers and kinds of objects it owns. In a relational database these facts are kept in special tables that can be manipulated by a computer. A logical database may have several related tables. For example, a library database might have a table about books and a table about library card holders (they are related because a library card holder can check out books). Database design is deciding what facts to keep in which tables.
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