Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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3) A relation is said to be in 3NF if it is in 2NF and no nonprime attribute of R is blank the primary key.
A) an alternate for
B) transitively dependent on
C) Part of
D) partially functionally dependent on
E) fully funcionally dependent on
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- Let R₁ and R₂ be the relations on X={a,b,c}, R₁={ (b,a), (c,b), (a,c) } R₂={ (a,c), (b,c)} R₁-¹= R₂ ° R₁=arrow_forwardExplain how functional dependencies may be used to indicate: • The entity sets student and teacher have a one-to-one relationship set.• Between entity setsstudent and teacher, there is a many-to-one connection set.arrow_forwardWhat is the difference between a weak and a strong entity set?arrow_forward
- Explain the process of decomposing a relation to achieve higher normal forms and the potential trade-offs involved.arrow_forwardQuestion 3Discuss in detailed explanation that the concept that an attribute that is part of a composite primary key is also a candidatekey.arrow_forwardxexplanation of three situations when a surrogate key should be produced for the primary key of a relation?arrow_forward
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