Is it always possible to achieve the following three goals for a relational database design simultaneously:...
Is it always possible to achieve the following three goals for a relational database design simultaneously: (a) BCNF; (b) lossless join; (c) dependency preservation.
Homework Answers
No. It is not always possible to achieve BCNF,lossless join and dependency preservation.
As it is not always possible to achieve both BCNF and dependency preservation, we consider a weaker normal form, known as 3NF. The dependencies are preserved in the 3NF.
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Is it always possible to achieve the following three goals for a
relational database design simultaneously:...
Given the following Schema S = (R, FD) where R = (A, B, C, D, E, F) and FD contains the following...
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Relational Database Design Theory, please answers ALL parts because they are related to each other, and I can't separate it into different questions. Please help! By looking at the PHLogger tab...
Relational Database Design Theory, please answers ALL parts
because they are related to each other, and I can't separate it
into different questions. Please help!
By looking at the PHLogger table:
A. List all non-trivial functional dependencies.
B. What is the highest normal form the PHLogger table is in
currently?
C. The external consulting experts at DBInstructor,
Inc., have noticed that city and state of an address can be
inferred by its postal code (zip code). What new functional
dependencies...
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consider the following relational database that records details of parts and suppliers. Primary keys are underlined...
consider the following relational database that records details
of parts and suppliers. Primary keys are underlined and the Foreign
Keys are identified with (FK).
Suppliers (sid, sname, address, credit)
Parts (pid, pname, color)
Catalog (sid (FK), pid (FK), cost)
The credit attribute denotes the size of the supplier’s credit
account. The Catalog relation lists the prices charged for parts by
Suppliers.
Which of the following queries returns the snames of suppliers who supply every part? Select one or more: a....
Accounting Info Systems
A. True B. False 10. Tables in a relational database are documented by a data flow diagram. A. True B. False 11. In database design, the recommended step after ER Diagram is A. Relational schema B. Database implementation C. Either of the above D. None of the above The next 2 questions refer to binary relationships. 12. One to many ER have diagram will havetables in the relational schema. A. One B. Two C. Three D. More...
Relational Database Design Theory, please answers ALL parts
because they are related to each other, and I can't separate it
into different questions. Please help!
By looking at the PHLogger table:
A. List all non-trivial functional dependencies.
B. What is the highest normal form the PHLogger table is in
currently?
C. The external consulting experts at DBInstructor,
Inc., have noticed that city and state of an address can be
inferred by its postal code (zip code). What new functional
dependencies...
consider the following relational database that records details
of parts and suppliers. Primary keys are underlined and the Foreign
Keys are identified with (FK).
Suppliers (sid, sname, address, credit)
Parts (pid, pname, color)
Catalog (sid (FK), pid (FK), cost)
The credit attribute denotes the size of the supplier’s credit
account. The Catalog relation lists the prices charged for parts by
Suppliers.
Which of the following queries returns the snames of suppliers who supply every part? Select one or more: a....
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