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01-Nov-2017 16:40

Codd showed that data relationships of arbitrary complexity can be represented by a simple set of concepts.

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When a new row is written to the table, a new unique value for the primary key is generated; this is the key that the system uses primarily for accessing the table. Other, more natural keys may also be identified and defined as alternate keys (AK).Often several columns are needed to form an AK (this is one reason why a single integer column is usually made the PK).



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