Multiple answers. Attachment and practice of sending unwanted messages
In a real-world environment, changing granularity requirements might dictate changes in primary key selection, and those changes might ultimately require the use of surrogate keys.
Explanation:
A surrogate key is a unique identity as an object or entity. It is used as an object in the database and as an entity in the modern world. Surrogate key is not a natural key hence it cannot be derived from application data.
Advantages of using surrogate key:
- They are unique
- They have uniform rules
- It allows unlimited values
- It stands the test of time
Answer:
// C++ program to find k largest elements in the array
#include <bits/stdc++.h>
using namespace std;
// main function
int main()
{
// variable
int n,k;
cout<<"Enter the number of elements of array:";
// read the value of n
cin>>n;
// declare the array of size n
int arr[n];
cout<<"Enter the elements of array:";
// read the elements of array
for(int a=0;a<n;a++)
{
cin>>arr[a];
}
cout<<"Enter the value of K:";
cin>>k;
// call the function to perform selection Sort
sort(arr, arr+n);
cout << k<<" largest elements of the array are: ";
// print k largest elements of the array
for (int i=n-1; i>n-k-1; i--)
cout << arr[i] << " ";
return 0;
}
Explanation:
Read the number of elements in the array.Then create an array of size "n" and read n elements of the array.Sort the array in ascending array.Then Read the value of k from user.Find the k Elements from the end of the array.This will be the k largest elements of the array.
Output:
Enter the number of elements of array:8
Enter the elements of array:34 8 75 99 12 7 5 55
Enter the value of K:3
3 largest elements of the array are: 99 75 55
