<P> First normal form (1NF) is a property of a relation in a relational database . A relation is in first normal form if and only if the domain of each attribute contains only atomic (indivisible) values, and the value of each attribute contains only a single value from that domain . The first definition of the term, in a 1971 conference paper by Edgar Codd, defined a relation to be in first normal form when none of its domains have any sets as elements . </P> <P> First normal form is an essential property of a relation in a relational database . Database normalization is the process of representing a database in terms of relations in standard normal forms, where first normal is a minimal requirement . </P>

To be in the first normal form each field of a table must contain
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