CALCULO RELACIONAL DE TUPLAS PDF

Received for review: April 15 th , , accepted: December 21 th , , final version: January 15 th , ABSTRACT: Many user requirements may involve preference criteria linguistically expressed by fuzzy terms in natural language; these requirements are called fuzzy requirements. Database query languages have been extended incorporating fuzzy logic to handle user-preference criteria. To the best of our knowledge, very few of the software development methods consider fuzzy queries.

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5. Lenguajes de bases de datos

Si la orden no se especifica, ASC es el valor predeterminado. Operator precedences are shown in the following list, from highest precedence to the lowest. Operators that are shown together on a line have the same precedence. ROUND TRUNC These are the only group of functions that do this.

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