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Second normal form
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== History == The second normal form was originally defined by [[E.Β F. Codd]] in 1971.<ref name="Codd">Codd, E.Β F. "Further Normalization of the Data Base Relational Model". (Presented at Courant Computer Science Symposia Series 6, "Data Base Systems", New York City, May 24β25, 1971.) IBM Research Report RJ909 (August 31, 1971). Republished in Randall J. Rustin (ed.), ''Data Base Systems: Courant Computer Science Symposia Series 6''. Prentice-Hall, 1972.</ref>
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