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iris [78.8K]
3 years ago
12

For each entity, select the attribute that could be the unique identifier of each entity.

Computers and Technology
1 answer:
Alika [10]3 years ago
3 0

Answer:

"student ID, number and title" is the correct answer for the above question.

Explanation:

  • The primary key is used to read the data of a table. It can not be duplicated or null for any records.
  • The "student ID" is used to identify the data of the "student" entity. It is because the "student ID" can not be duplicated or null for any records. It is because every student has a unique "student ID".
  • The "number" is used to identify the data of the "Locker" entity. It is because the "number" can not be null or duplicate for any records. It is because every locker has a unique "number".
  • The "title" is used to identify the data of the "Movie" entity. It is because the "title" can not be Null or duplicate for any records. It is because every movie has a unique "title".
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All except It makes a company look modern.  

Explanation:

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Brad, a project manager, wants to build a database to integrate information about employees and tasks that they handle. Brad wan
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3 years ago
The program that solves problem 2 (a) on p.275 should be named as proj4_a.c. It must include and implement the following functio
avanturin [10]

Answer:

#include <iostream>

#include <cstring>

using namespace std;

bool isAPalindrome(char* palindrome);

int main()

{

   char palindrome[30];

   bool palindrome_check;

   cout << "Please enter an word or phrase.\n";

   cin.getline(palindrome, 30);

   palindrome_check = isAPalindrome(palindrome);

   if (palindrome_check = true)

   {

       cout << "Input is a palindrome\n";

   }

   else

   {

       cout << "Inputis not a palindrome\n;";

   }

system("pause");

return 0;

}

bool isAPalindrome(char* palindrome)

{

   char* front;  

   char* rear;  

front = palindrome;// starts at the left side of the c string

rear = (palindrome + strlen(palindrome)) - 1;//starts at the right side of the c-string. adds the c string plus the incriment value of s

while (front <= rear)

{

 if (front = rear)

 {

  front++;

  rear--;

 }

 else

 {

  return false;

 }

}

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7 0
3 years ago
Write the definition of a function named newbie that receives no parameters and returns true the first time it is invoked (when
kondaur [170]

Answer:

The function definition to this question can be described as follows:

bool newbie() //defining a bool method newbie

{

static bool y = true ; // defining a static bool variable y and assign value true

bool t1=y; //defining bool variable t1 and assign value of variable y

y=false; // assigning value in variable y

return t1; // return value of variable t1

}

Explanation:

The program to this question can be described as follows:

Program:

#include <iostream> //defining header file

using namespace std;

bool newbie() //defining a bool method newbie

{

static bool y = true ; // defining a static bool variable y and assign value true

bool t1=y; //defining bool variable t1 and assign value of variable y

y=false; // assigning value in variable y

return t1; // return value of variable t1

}

int main() //defining main method

{

int s,s1; //defining integer variable s,and s1

s=newbie(); // variable s that call method

cout<<s<<endl; //print value

s1=newbie();//variable s that call method

cout<<s1;  //print value

return 0;

}

Output:

1

0

Description:

The description of the above function can be described as follows:

  • In the above method definition a boolean method "newbie" is declared, which can't accept any parameters, inside the method, two boolean variable "y and t1" is declared.
  • In this variable, variable y is a static boolean variable, that assigns a true value, and in t1 variable, we hold static variable value.  
  • In the next step, the "y" variable assigns a value, that is false and returns variable t1 value.
  • In the next step, the main method is declared, inside these two integer variable s, s1 is declared, that calls a method, and prints it value in the first time, it will print 1, that means the false and second time it will print 0, that means false.
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