4NF -->
fourth normal form
computing dictionary

<database design> A series of steps followed to obtain a database design that allows for efficient access and storage of data in a relational database. These steps reduce data redundancy and the chances of data becoming inconsistent.

A table in a relational database is said to be in normal form if it satisfies certain constraints. Codd's original work defined three such forms but there are now five generally accepted steps of normalisation.

See: 1NF, 2NF, 3NF, 4NF, 5NF.

Fourth normal form separates independent multi-valued facts stored in one table into separate tables.

(01 Oct 2005)