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First normal form (1NF)

In relational data analysis, a relation is in first normal form if all the values taken by the attributes of that relation are atomic or scalar values the attributes are single-valued or, alternatively, there are no repeating groups of attributes.

Foreign key

One or more attributes in a relation (or columns in a table) that implement a many-to-one relationship that the relation (or table) has with another relation (or table) or with itself.

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