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Codd considered 1NF mandatory for relational databases, while the other normal forms were merely guidelines for database design.<ref>Codd, E. F. (1979). Extending the Database Relational Model to Capture More Meaning. ACM Transactions on Database Systems,Vol. 4, No. 4, December 1979, Page 413</ref>
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A [[Relation (database)|relation]] is on first normal form if no [[attribute ___domain]] has relations as elements.<ref>Codd, E. F. (1972). "Further Normalization of the Data Base Relational Model". p. 27</ref>
== Background ==
First normal form was introduced in 1970 by [[Edgar F. Codd]] in the paper ''A Relational Model of Data for Large Shared Data Banks'', although initially it was simply referred to as "normal form". It was renamed to "first normal form" when Codd introduced additional normal forms in his paper ''Further Normalization of the Data Base Relational Model'' in 1971.<ref>Codd, E. F. (1971). Further Normalization of the Data Base Relational Model. Courant Computer Science Symposium 6 in Data Base Systems edited by Rustin, R.</ref>
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