Unnormalized form

In database normalization, unnormalized form (UNF or 0NF), also known as an unnormalized relation or non-first normal form (N1NF or NF²),^[1] is a database data model (organization of data in a database) which does not meet any of the conditions of database normalization defined by the relational model. Database systems which support unnormalized data are sometimes called non-relational or NoSQL databases. In the relational model, unnormalized relations can be considered the starting point for a process of normalization.

"Unnormalized form" should not be confused with denormalization, where normalization is deliberately compromised for selected tables in a relational database.

^ Kitagawa, Hiroyuki; Kunii, Tosiyasu L. (1990-02-06). The Unnormalized Relational Data Model. Springer. pp. 1, 5, 7, 10. ISBN 978-4-431-70049-4.

[:0-1] Kitagawa, Hiroyuki; Kunii, Tosiyasu L. (1990-02-06). The Unnormalized Relational Data Model. Springer. pp. 1, 5, 7, 10. ISBN 978-4-431-70049-4.

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