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Basile [38]
2 years 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]2 years 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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When you connect to an unsecured wireless network, what might dishonest or unscrupulous computer users try to do?
loris [4]

Answer:

Hackers can snoop on data sent over your network.

Hackers can use your network to access your computer's files and system information.

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8 0
2 years ago
1. Discuss why it is so important for all application builders to always check data received from unknown sources, such as Web a
Ivan

Answer:

1. It is so important for all application builders to always check data received from unknown sources before using that data. This is because of the Security related reasons and vulnerabilities .For example the data received might contain harmful hidden viruses.  Web applications are accessed by internet and these are the most vulnerable to attacks by hacker or intruders using harmful data containing malware. This can cause security breaches due to the security flaws or bugs in Web applications. So to overcome such security risks which can cause damage in the Web applications, data from unknown sources should be checked.

Explanation:

2. When the Website is being used and running, there is a room for possible glitches or other bugs and issues. To understand, handle and address  issues successfully, the website operators carefully and consistently patch and configure their systems. The administrators collect the user data which enables them to have enough data in order to make the requisite alterations or improvements in the website. This also helps to improve the website performance. The patching and configuring of systems fix problems in the website which reduces the risk of website damage and the website works smoothly this way. Moreover it identifies vulnerabilities, solve configuration issues and upgrades in website features provide additional capabilities to the website.

8 0
2 years ago
add is a method that accepts two int arguments and returns their sum. Two int variables, euroSales and asiaSales, have already b
Oduvanchick [21]

Answer:

// here is code in Java.

// package

import java.util.*;

// class definition

class Main

{

   // method that return sum of two sale value

   public static int Add(int euroSales,int asiaSales)

   {

       // return the sum

       return euroSales+asiaSales;

   }

   //main method of the class

public static void main (String[] args) throws java.lang.Exception

{

   try{

    // variables

       int euroSales=100;

       int asiaSales=150;

       int eurasiaSales;

        // call the function

       eurasiaSales=Add(euroSales,asiaSales);

        // print the sum

       System.out.println("total sale is:"+eurasiaSales);

   }catch(Exception ex){

       return;}

}

}

Explanation:

Declare and initialize two variables "euroSales=100" and "asiaSales=150". Declare another variable eurasiaSales. Call the method Add() with euroSales and asiaSales as parameter. This method will add both the value and return the sum.This sum will be assigned to variable eurasiaSales.Then print the sum.

Output:

total sale is:250  

8 0
2 years ago
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