Question: Given a relational schema R with attributes A, B, C, and D, where functional dependencies B-> ACD and C -> D are supposed to

Given a relational schema R with attributes A, B, C, and D, where functional dependencies B-> ACD and C -> D are supposed to hold. (a) What are all the keys in ABCD? (b) Give example of a superkey in ABCD that is not a key. (c) Give example of a superkey in ABCD that is also a key. (d) Give example of a trivial functional dependency over ABCD.

Step by Step Solution

★★★★★

3.31 Rating (148 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

Lets break down each part of your question a What are all the keys in ABCD A key is a minimal set of ... View full answer

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!

In 1996 Johnny and Edgar filed suit against DC Comics and the creators of the Jonah Hex: Riders of the Worm and Such limited series, claiming, among other things, defamation: two characters named...

Write programs that implement Algorithms 15.4 and 15.5. Algorithm 15.4 Relational Synthesis into 3NF with Dependency Preservation and Nonadditive Join Property Input: A universal relation R and a set...

Introduction This research paper mainly focuses on history of evolvement of normalization from a set of relation schemas, along with sequential normalization forms with suitable examples. This paper...

Jake needed a summer job and was lucky enough to land a position as a ticket collector at a local amusement park. On his first day, he was assigned to work alongside Tim who had worked at the park...

One hundred kilogram-moles per hour of a three-component bubble-point mixture to be separated by distillation has the following composition: (a) For a distillate rate of 60kmol/h, five theoretical...

=+Why is a radio commercial that features a rock star and golf star a good promotional idea?

Give an example of upward comparison and an example of downward comparison.

Pasquale Products Co. has two departments: Mixing and Cooking. At the beginning of the month, Cooking had 4,000 units in process with costs of $8,600 from Mixing, and its own departmental costs of...

Prepare journal entries, posting and 10 column work sheet. Use excel format. a. Insurance for one month has expired. b. Medical supplies on hand at month-end amounted to P21,000. c. Depreciation on...

The equipment Kevin's team uses is failing, becoming a safety hazard, and reducing productivity. The maintenance budget was recently reduced. Kevin is meeting with leadership to discuss the problem....

The Homeland Security Act does what two things. Group of answer choices threatens union power gives the president the right to waive certain union rights if homeland security is threatened does not...

Refer to Figure 12-4. Potential GDP equals $500 billion. The economy is currently producing GDP1 which is equal to $400 billion. If the MPC is 0.8, then how much must autonomous spending change for...

Paul Simon shoots a .2 kg puck at 25 m/s and Patrick Roy catches the puck for .3 seconds. How much force does Patrick Roy absorb?

Question 4. (11 points) Assume that a closed economy is characterized by the following equations: Consumption: C = 100 + (2/3) (Y -T) Tax: T = 600 Government spending: G = 500 Investment: I = 800 -...

1.Suppose you have two part-time jobs, Restaurant Server and Uber Driver. After younger servers start working for less, employers pay only $11 instead of $14 per hour. What happens to your supply of...

Problem 1 - Brinell E Rockwell El Bookmark this page Test clue Jul 2?, 202212200 {33 Brinell 8. Rockwell D.Dl'2. points [gradedl Brinell s Rockwell lBaRl is a high-end manufacturer of cutting and...

Deltona Motors just issued 230,000 zero-coupon bonds. These bonds mature in 18 years, have a par value of $1,000, and have a yield to maturity of 5.9 percent. What is the approximate total amount of...

Refer to Exercise 8.S.I. Construct a scatterplot of the data. Does the appearance of the scatterplot indicate that the pairing was effective? Explain. Exercise 8.S.I. A volunteer working at an animal...

What are the main features of Apache Hive? What is its high-level query language?

Consider the ER diagram in Figure 3.23. Assume that an employee may work in up to two departments or may not be assigned to any department. Assume that each department must have one and may have up...

Repeat Laboratory Exercises 8.34 through 8.38 in domain relational calculus (DRC) by using the DRC interpreter. Exercises 8.34 Specify and execute the following queries in relational algebra (RA)...

H-P executives indicate that they use traditional discounted cash flow (DCF) analysis to evaluate investment projects and that the firm's cost of capital is about 12 Percent. Consider Exhibit 10.2...

The ABC is considering a $100,000 investment in either of two companies. The cash flows are as follows: a. Using the payback method, what will the decision be? b. Explain why the answer in part a can...

Researchers wanted to compare math test scores of students at the end of secondary school from various countries. Eight randomly selected students from Canada, Denmark, and the United States each...