Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Briefly discuss the properties of a relation.
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- What three situations make it necessary to make a substitute key instead of the main key of a relation?arrow_forwardWhat are three cases when a surrogate key might be used in place of a relation's main key?arrow_forwardHere are three examples of when it makes sense to create a surrogate key in place of the primary key in a relation.arrow_forward
- 1)A tuple is a named column of a relation. True or alse2)Each attribute in a relation has a distinct name. T/F3)The degree of a relation is the number of attributes it contains. T/F4)A foreign key is the candidate key that is selected to identify tuples. T/Farrow_forwardEach relationship is mapped into a relation? true or falsearrow_forwardWhat does the term "relationship" mean? What are the qualities of a relation defined as?arrow_forward
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