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Basile [38]
1 year ago
9

Suppose that we pick the following three tuples from a legal instance of a relation S (S has 100 tuples in total). Relation S ha

s the following schema: (A : integer, B : integer, C : integer). The three tuples are: (1,2,3), (4,2,3), and (5,3,3). Which of the following dependencies can you infer does not hold over S?
A. A → B,
B. BC → A,
C. C → B
Computers and Technology
1 answer:
AysviL [449]1 year ago
8 0

Answer:

The correct answer is BC → A, A does not hold over S. we noticed the tuples (1 ,2 ,3 ) and (4 ,2 ,3) which can hold over S)

Explanation:

Solution

No, since in this case the instance of S is provided. so such particular dependencies are unable to breach through such instance, but unable to tell which the dependencies hold towards S.

A functional dependency holds towards only when a relation forms a statement regarding the complete allowed instances of relation.

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A contact list is a place where you can store a specific contact with other associated information such as a phone number, email
Arte-miy333 [17]

Answer:

# The user in prompted for input and stored in userInput

userInput = str(input("Enter the contact: "))

# The user input is splitted and stored in splitUserInput

# splitUserInput is a list because split returns a list

splitUserInput = userInput.split(" ")

# The user is prompt to enter the search contact

# The search contact will have the first letter capitalize

# should it be entered in lower case all through

searchContact = str(input("Enter the search contact: "))

# loop through the list

for i in range(len(splitUserInput)):

   # compare if the string at any value of i

   # is the same as the searchContact

   # we display the string ahead of it

   # by adding 1 to the index

   if(splitUserInput[i] == searchContact):

       print(splitUserInput[i + 1])

Explanation:

A sample screenshot is attached. The code is written in Python 3 and well commented.

The program prompt the user for input then split the input into a list. It then asked for a contact to search for. It begins looping through the list, if the search contact is found at any index, then it prints what is in front of the index.

5 0
2 years ago
Given positive integer numInsects, write a while loop that prints that number doubled without reaching 200. Follow each number w
Gre4nikov [31]

Answer:

numInsects = 16

while numInsects < 200:

   print(str(numInsects) + " ", end="")

   numInsects *= 2

Explanation:

*The code is in Python.

Set the numInsects as 16

Create a while loop that iterates while numInsects is smaller than 200. Inside the loop, print the value of numInsects followed by a space. Then, multiply the numInsects by 2.

3 0
2 years ago
Create a class named Poem that contains the following fields: title - the name of the poem (of type String) lines - the number o
denpristay [2]

Answer:

Couplet.java



public class Couplet extends Poem

{

private final static int LINES = 2;

public Couplet(String poemName)

{

super(poemName, LINES);

}

}

Haiku.java

public class Haiku extends Poem

{

private static int LINES = 3;

public Haiku(String poemName)

{

super(poemName, LINES);

}

}

Limerick.java

public class Limerick extends Poem

{

private static int LINES = 5;

public Limerick(String poemName)

{

super(poemName, LINES);

}

}

Poem.java

public class Poem

{

private String poemName;

private int lines;

public Poem(String poemName, int lines)

{

this.poemName = poemName;

this.lines = lines;

}

public String getPoemName()

{

return poemName;

}

public int getLines()

{

return lines;

}

}

DemoPoem.java

import java.util.*;

public class DemoPoems

{

public static void main(String[] args)

{

Poem poem1 = new Poem("The Raven", 84);

Couplet poem2 = new Couplet("True Wit");

Limerick poem3 = new Limerick("There was an Old Man with a Beard");

Haiku poem4 = new Haiku("The Wren");

display(poem1);

display(poem2);

display(poem3);

display(poem4);

}

public static void display(Poem p)

{

System.out.println("Poem: " + p.getPoemName() +

" Lines: " + p.getLines());

}

}

Explanation:

The Couplet and Limerick classes should also be <u>extended from Poem class</u>. Also, in display method, you call getTitle(), however, it's written as getPoemName() in the <em>Poem</em> class. You need to change the name.

7 0
2 years ago
Suppose that a 10-Mbps wireless station is transmitting 50-byte frames one immediately after the other.
Andre45 [30]
8 bits = 1 byte

10 Mbps = 10/8 M bytes per second

1 frame = 50 bytes

Frame rate = 10 M / (8 x 50) =  10 M / 400 = <em>25,000 frames per second</em>

========================

If each frame has an error probability of 0.004, then (0.004 x 25,000) = 100 frames per second are damaged.

1 hour = 3,600 seconds.

100 damaged frames per second = (100 x 3,600) = <em>360,000 damaged frames per hour.</em>
7 0
2 years ago
Read 2 more answers
William has an internet connection that does not allow him to make calls when connected to the Internet. What internet service c
saul85 [17]
D. Satellite internet access
6 0
1 year ago
Read 2 more answers
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