All categories

3 years ago

Choose all of the correct answers for each of the following:

Computers and Technology

1 answer:

In-s [12.5K]3 years ago

7 0

Answer:

[1] = 10

[2] = The same natural joins with their super entity set

[3] = Is in 3NF if R is in BCNF

[4] = Neither "1" or "2"

[5] = When changes in R.A are made

Explanation:

[1] The number of super keys of a relation R(A, B, C, D) with keys {A} and {B, C} is 10. The super keys of the given relations are {A}; {A, B}; {A,C}; {A,D}; {A,B,C}; {A,B,D}; {A,C,D}; {A,B,C,D}; {B,C}; {B,C,D}.

[2] key is used to uniquely identify entity from entity set. So key for every entity is unique. Subentities can have different attributes. Also functional dependencies can be different but natural join with their super subsets will be same.

[3] For a relation R to be in BCNF it must be in 3NF but If a relation R is in 3NF it is not necessary that it will be in BCNF.

[4] The natural join of relations R and S is expressed by R ✕ S.

[5] If tuple constraint references an attribute R.A to S.B then every time a change is done in R.A the tuple constraint is checked.

You might be interested in

Julio receives many emails from a healthcare site. He finds them useful, and he wants to save them all in a folder. How can he a

inysia [295]

Answer:

Explanation:

I took the test

6 0

3 years ago

* Declare a variable called "race" of type "Race", andinitialise its value to a new instance of the "Race" class. The"Race" cons

goldfiish [28.3K]

Answer:

Race race = new Race(track, car);

Explanation:

Complete code fragment is as follows:

Track track = new Track();

Car car = mycar;

Race race = new Race(track,car);

Here we are declaring a variable race of the type Race which is initialized to new instance of Race class. The constructor of race takes up the following 2 arguments:

1) New Instance of Track class;

2) Previously defined reference to an object of type Car.

4 0

4 years ago

Use port in a sentence

vekshin1

Answer:

The USB port needs to be clear to function correctly.

8 0

3 years ago

When a bank account pays compound interest, it pays interest not only on the principal amount that was deposited into the accoun

Talja [164]

Answer:

def main():

principal = float(input("Enter the amount of principal amount to be deposited: "))

rate = float(input("Enter annual interest rate paid by the account: "))

num = int(input("Enter the number of times per year that the interest is compunded: "))

years = float(input("Enter the number of years the account will be left to earn interest: "))

amount = principal*(1+(rate*.01)/num)**(num*years)

print("The amount of money will be in the account after ", years, "years:", round(amount,2))

main()

Explanation:

Calculating the balance of the account after a specified number of years with the help of the formula:
amount = principal*(1+(rate*.01)/num)**(num*years)

8 0

3 years ago

I don't have a split screen in my Samsung Galaxy A02 why???

weqwewe [10]

Answer:

YOU CAN open

Turn on Multi Window

1. Select the Recent apps key. 2. Select the desired app icon, then select Open in split screen view.

Explanation:

PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT

6 0

2 years ago