The statements of this language enable the creation and modification of the structures in which the data will be stored. Examples of DDL statements are: CREATE (to create objects of the database: tables, views, etc.), DROP (to remove objects), ALTER (to modify objects), and statements for security controls, indexes, and for the control of the physical storage of the data.
Published in Chapter:
FSQL and SQLf: Towards a Standard in Fuzzy Databases
Angélica Urrutia (Universidad Católica del Maule, Chile), Leonid Tineo (Universidad Simón Bolivar, Venezuela), and Claudia Gonzalez (Universidad Simón Bolivar, Venezuela)
Copyright: © 2008
|Pages: 29
DOI: 10.4018/978-1-59904-853-6.ch011
Abstract
Actually, FSQL and SQLf are the main fuzzy logic based proposed extensions to SQL. It would be very interesting to integrate them with a standard for fuzzy databases. The issue is what to take from one or other proposal. In this chapter, we analyze FSQL and SQLf making a comparison in several ways: approach direction, fuzzy components, system architecture, satisfaction degree, evaluation mechanisms, and experimental performance. We observe that there are powerful and interesting features in both proposals that could be mixed in a unified language for fuzzy relational databases.