Navigational High-Level Interface for an Expert Data Base
simple data description language, which allows description of the logical structure of the system,
possibilities to extend or reduce the database schema at any level of the data hierarchy,
high-level, non procedural end-user language,
full independence of data and programs,
relieving the user of the details concerning the physical organization of the database.
KeywordsQuery Language Database Management System Database Schema Network Database Full Independence
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