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who found the principles of the relational model of database?

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who found the principles of the relational model of database?
posted May 15, 2015 by Kunal Kapoor

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The relational model for database management is a database model based on first-order predicate logic, first formulated and proposed in 1969 by Edgar F. Codd.

answer May 18, 2015 by Manikandan J
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