
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 distinguishes data attributes from data items in the data hierarchy? An attribute's scope?
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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_forwardWhere do data characteristics and data items stand in the data hierarchy, and what distinguishes them from one another? How does the scope of an attribute work?arrow_forwardWhat considerations should be taken into account when deciding on the data type for an attribute?arrow_forward
- 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?arrow_forwardHow do data models accommodate for hierarchical relationships within data sets?arrow_forwardWhen a data item is not included in a data model, what factors contribute to this decision?arrow_forward
- How come a data item isn't part of the model?arrow_forwardIdentifying relationships, non-identifying relationships, and non-specific relationships should all be described in a database's representations of their respective types.arrow_forwardHow are multiple-valued attributes and recurrent groups different?arrow_forward
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