Data Systems > TEST BANKS > Exam (elaborations) CECS 6605 (All)
Exam (elaborations) CECS 6605
Document Content and Description Below
1.What is a recursive relationship? How is the recursive relationship denoted diagrammatically in the Chen like ER model? Can all ternary relationships be expressed in the form of binary relationshi... ps?What is a specialization? Come up with another example of a specialization. Explain. 4.What is an overlap constraint? What symbol shows the overlap constraint in EER diagrams? The overlap constraint indicates that the supertype instance may be a member of the two or more subtypes. Symbols o d means "disjoint"- what it tells is the subclasses must have disjoint sets of entities o O means "overlap" The subclasses may have overlapping sets of entities. o U symbol indicates the Subtype is a subset of the Supertype. o Place o or d in specialization circle to indicate constraint. [Show More]
Last updated: 2 years ago
Preview 1 out of 221 pages
Buy this document to get the full access instantly
Instant Download Access after purchase
Buy NowInstant download
We Accept:
Reviews( 0 )
$14.50
Can't find what you want? Try our AI powered Search
Document information
Connected school, study & course
About the document
Uploaded On
Feb 01, 2023
Number of pages
221
Written in
Additional information
This document has been written for:
Uploaded
Feb 01, 2023
Downloads
0
Views
61
