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Context, dear boy, context A data model is a methodology for storing, handling and manipulating data. There are lots of them around. One of the most commonly employed at present is the relational model. Brainchild of Edgar Codd, it rapidly came into favour after he published hisseminal paper in 1970. Many of the popular database engines today (for example DB2, Oracle and SQL Server) are based on the relational model.
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