On the irreducible non first normal form relations (Q1096426)
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scientific article; zbMATH DE number 4031059
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | On the irreducible non first normal form relations |
scientific article; zbMATH DE number 4031059 |
Statements
On the irreducible non first normal form relations (English)
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1987
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The algebraic properties of non first normal form relations (NFR) are discussed. To introduce canonical forms and irreducible forms, two operations, nest and composition, are separately used. We investigate the condition under which both classes are matched. Regularity condition is proposed in which there exists only one irreducible form. Testing regularity is also discussed, and efficient procedures are presented. As the application, the fixed attributes on NFR, which extend key concept, are characterized.
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relational databases
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data dependency theory
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non first normal form relations
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canonical forms
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irreducible forms
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nest
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composition
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regularity
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