
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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What are the main differences between a data item and a data attribute within the framework of the data hierarchy? To what extent can we define the scope of an attribute?
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- In the context of the data hierarchy, what are the most significant distinctions that can be made between a data item and a data attribute? What precisely does it mean for an attribute to have scope when it is stated that it does?arrow_forwardWhat are user-defined data types (UDTs) in databases, and how can they be created and used to represent complex data structures?arrow_forwardHow do data models accommodate for hierarchical relationships within data sets?arrow_forward
- The conditions under which the database designer should employ supertype and subtype connections are outlined.arrow_forwardWhat distinguishes data attributes from data items in the data hierarchy? An attribute's scope?arrow_forwardA data hierarchy has to be recognizable up to the database layer in order for all of its components to work together appropriately.arrow_forward
- Database design diagrams (DBDL) and entity-relationship (E-R) diagrams (ER) are both valid ways to depict a database's structure. For what reasons do you choose one tactic over another?arrow_forwardTo what end is a data model necessary, and how will it assist us in reaching our objective?arrow_forward
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