Question: What is the difference between a candidate key and the primary key for a given relation? What is a superkey?

What is the difference between a candidate key and the primary key for a given relation? What is a superkey?

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer
Step: 1 Unlock blur-text-image
Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock
Step: 3 Unlock

Students Have Also Explored These Related Databases Questions!

Q:

What is the difference between a candidate key and the primary key for a given relation? What is a superkey?

Q:

Exercise 3.1 Dene the following terms: relation schema, relational database schema, domain, attribute, attribute domain, relation instance, relation cardinality, and relation degree. Exercise 3.4...

Q:

What is the difference between a candidate key and the primary key for a given relation? What is a superkey? What is prime attribute types?

Q:

Explain in approximately one paragraph why the requirements analysis phase of the database lifecycle is so important. Include the type of information you typically want to discover and the types of...

Q:

10. (16 points) For each of the following questions, circle either T (True) or F (False). 132 a. T F A specialization hierarchy is a result of multiple inheritance in EER models. Tolo3.8 GMA...

Q:

Let Q (Tom, Mary, Jim) and R= {walking, running). Create a relation with Q and R as domains. Consider the relation schema containing book data for a bookstore: isbn, publisher, pubDate, Book (title,...

Q:

8. 8 . Consider the following relation instance of the CAR relation schema : a. What is the minimal cover of functional dependencies that exists in CAR? b. What is (are) the candidate key(s) of CAR?...

Q:

Help me out with problem 4.3 please Consider the relation schema containing book data for a bookstore: Book (title, author, isbn. publisher. pubDate. pubCity, qtyOnHand) a. Write out the table for an...

Q:

Exercise 4 . 3 ( { part a: 1 , part b: 3 } ) : Consider the relation schema containing book data for a bookstore: Book ( title , author, isbn, publisher, pubDate, pubCity, qtyOnHand ) a . Write out...

Q:

Which of the following statements are true and please explain carefully WHY? A. Each superkey is a superset of some candidate key. B. Each primary key is also a candidate key, but there may be...

Q:

Reagan Corporation computed income from continuing operations before income taxes of $4,200,000 for 2011. The following material items have not yet been considered in the computation of income: 1....

Q:

Describe the three ways in which corporations acquire funds for investment.

Q:

Which of the following items would affect Harry and Alice's net worth? Payment of $ 1 , 2 0 0 of their current credit card balance using funds from their savings account Purchasing a used automobile...

Q:

P-1) (100 Pts.) A chemical manufacturing company (CMC) has a contract for the procurement of the neccssaly chemicals from four suppliers. The chemicals purchased from Supplier A are priced at $20...

Q:

(Appendices) During the 20072009 recession, debate in the U.S. Senate over an extension of unemployment benefits to workers who had exhausted their benefits was often heated and contentious. A...

Q:

(Appendices) Courtney, age 22, is a junior at a large midwestern university. In late March, she filed applications for summer jobs with three companies. However, she does not want to start work until...

Q:

(Appendices) Some states have second-injury funds in their workers compensation programs. However, in recent years, a number of states have terminated such funds.LO6 a. How does a second-injury fund...