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sweet-ann [11.9K]
4 years ago
6

Why are duplicate tuples not allowed in a relation?

Computers and Technology
1 answer:
velikii [3]4 years ago
4 0

Answer:

Explanation:

Duplicate tuples are not allowed in a relation because the specifications of the constraints of the regional integrity are violated, especially the main constraint that states that there can be no identical values for the attributes of two tuples at any database relation state.

Also, duplicate tuples are not allowed in a relation due to the fact that they lead to redundancy of the data base which in turn, slowing down the speed of the database when data processing such as inserting, querying, updating, deleting, etc are being performed.

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5.18 LAB: Output numbers in reverse Write a program that reads a list of integers, and outputs those integers in reverse. The in
Rina8888 [55]

Answer:

In C++:

#include<iostream>

#include<vector>

using namespace std;

int main(){

   int len, num;

   vector<int> vect;

   cout<<"Length: ";

   cin>>len;  

   for(int i = 0; i<len;i++){

       cin>>num;

   vect.push_back(num);}

   vector<int>::iterator iter;

   for (iter = vect.end() - 1; iter >= vect.begin(); iter--){

       cout << *iter << ", ";}    

}

Explanation:

This declares the length of vector and input number as integer

   int len, num;

This declares an integer vector

   vector<int> vect;

This prompts the user for length  

cout<<"Length: ";

This gets the input for length  

   cin>>len;  

The following iteration gets input into the vector

<em>    for(int i = 0; i<len;i++){</em>

<em>        cin>>num;</em>

<em>    vect.push_back(num);}</em>

This declares an iterator for the vector

   vector<int>::iterator iter;

The following iterates from the end to the beginning and prints the vector in reverse

<em>    for (iter = vect.end() - 1; iter >= vect.begin(); iter--){</em>

<em>        cout << *iter << ", ";}</em>

<em />

<em />

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3 years ago
For things like school, you should have a more serious:
german

Answer:

who and what do you mean

Explanation:

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Answer:

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Explanation:

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The most widely recognized components utilized in a PERT chart are:  

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It does not include the Estimated span of time.

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