Which of the following statements is correct? a. A foreign key of a relation A cannot refer

Question:

Which of the following statements is correct?

a. A foreign key of a relation A cannot refer to the primary key of the same relation

A. b. A relation cannot have more than one foreign key.

c. Every relation must have a foreign key.

d. A foreign key can be NULL.

Fantastic news! We've Found the answer you've been seeking!

Step by Step Answer:

Related Book For book-img-for-question

Principles Of Database Management The Practical Guide To Storing Managing And Analyzing Big And Small Data

ISBN: 9781107186125

1st Edition

Authors: Wilfried Lemahieu, Seppe Vanden Broucke, Bart Baesens

See More Books

Question Posted: Dec 18, 2023 01:32 AM

See More Questions

1. Hannah is applying for a life policy on her girlfriend Sarahs life. The policy is $500,000 and carries a large premium. Hannah is the main earner, so she is concerned about not being able to pay...
KYC's stock price can go up by 15 percent every year, or down by 10 percent. Both outcomes are equally likely. The risk free rate is 5 percent, and the current stock price of KYC is 100. (a) Price a...
Which of the following statements is correct about monetary unit sampling? a. The risk of incorrect acceptance must be specified. b. Smaller logical units have a higher probability of selection in...
The temperature of air changes from 0 to 10C while its velocity changes from zero to a final velocity, and its elevation changes from zero to a final elevation. At which values of final air velocity...
The pretax operating incomes of Pop Corporation and Son Corporation, its 70 percent-owned subsidiary, for 2011 are as follows (in thousands): ADDITIONAL INFORMATION1. Pop received $280,000 dividends...
What types of changes is Chobani planning to establish itself as a company?
In a train moving due north at $3.1 \mathrm{~m} / \mathrm{s}$ relative to Earth, a passenger carrying a suitcase walks due north down the aisle at $1.2 \mathrm{~m} / \mathrm{s}$ relative to the...
Suppose that the court determines that the parties did not reach an agreement. Further suppose that Amstel, in anticipation of building Durbins studio, had purchased materials and refused other jobs...
19.A radioactive -emission. A detector records n -particles in 2s and by next 2s (accumulatively) it records 1.1 n -particle. Number of -particles recorded by detector after a long time, is (1) 11n...
Given the following EER model for an electricity market: Discuss some examples of semantics that cannot be enforced by the EER model; Map the model to a relational model representation. Discuss the...
Given the following assumptions: normalize the following relation: Flight (Flightnumber, Flighttime, airline (airlinename), passenger (passengername, gender, date of birth), pilot (pilotname, gender,...
Karen Weller, D.D.S., opened a dental practice on January 1, 2020. During the first month of operations, the following transactions occurred. 1. Performed services for patients who had dental plan...
Would you consider flexible scheduling which allowed you to have work-life balance a benefit? Why, or why not? What step would you like to see your current (or previous) employer take to help enhance...
Alan rents a flat in a block of units in the eastern suburbs of Sydney. One summer evening, during a balcony BBQ, Alan tosses several empty beer cans onto the adjoining balcony of the flat rented by...
Do your prices take into account any seasonal variation to your suppliers' costs?
National Motors is an auto manufacturing company. It sells a new EV car to Elon for $45,000. On the very day Elon buys the car, he is driving the car on the West Side Highway when the power steering...
Identify the sentence that uses the apostrophe correctly to form contractions.
Determine the filing status in each of the following situations: a. Angela is single for most of the year. She marries Tim on December 30. b. Earl is divorced during the current year. Their son lives...
Avatar Financials, Inc., located on Madison Avenue, New York City, is a company that provides financial advice to individuals and small- to mid-sized businesses. Its primary operations are in wealth...
From Fig. 4-34, we see that a Bluetooth device can be in two piconets at the same time. Is there any reason why one device cannot be the master in both of them at the same time? Figure 4-34 Piconet 1...
What is the maximum size of the data field for a 3-slot Bluetooth frame at basic rate? Explain your answer.
Figure 4-24 shows several physical layer protocols. Which of these is closest to the Bluetooth physical layer protocol? What is the biggest difference between the two? Figure 4-24 Upper layers...
3.47 A closed, rigid tank contains Refrigerant 134a, initially at 100C. The refrigerant is cooled until it becomes saturated vapor at 20C. For the refrigerant, determine the initial and final...
2. Every autumn, Reidor's Rakes (RRs) sells industrial-strength rakes in the White Mountains. RRs builds inventory before the peak leaf season starts. Due to its remoteness, no replen- ishment is...
2. Determine the rate of heat loss in a 100 ft by 12 ft wall when the outside temperature is 10F and indoor temperature is 70F. Half the wall area consists of windows of frame type 16, operable,...

Which of the following statements is correct? a. A foreign key of a relation A cannot refer

Question:

Step by Step Answer:

d A foreign key can be NULL Among the given statements option d is the co...View the full answer

Principles Of Database Management The Practical Guide To Storing Managing And Analyzing Big And Small Data

Students also viewed these Computer science questions