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lbvjy [14]
3 years ago
15

A ____ is any key that uniquely identifies each row.

Computers and Technology
1 answer:
Mrac [35]3 years ago
6 0
<span>A _superkey___ is any key that uniquely identifies each row.</span>
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How do u set up a Wi-Fi network on Android ​
AlladinOne [14]

Answer:

These are some way I know

5 0
3 years ago
IT professionals recognize that successful systems must be user-oriented, and users need to be involved, formally or informally,
bogdanovich [222]

Answer:

True is the correct answer for the above question.

Explanation:

  • The software is a collection of instruction which states the computer to how to do a specific work. The software developer only develops the software, but it is used by many users of the software who wants to do some specific task.
  • The developer creates a graphical event for users through which the user can use the software of the computer system for his personal use.
  • So the above line concludes that the software is for the user only. So the user interaction in software development is necessary which is also said by the question-statement. Hence the question statement is the true statement.
5 0
4 years ago
A personal phone directory contains room for first names and phone numbers for 30 people. Assign names and phone numbers for the
Fynjy0 [20]

Answer:

# include <iostream.h>

# include <stdio.h>

# include <string.h>

using namespace std;

class citizen

{      

    int i;

    public string name[30];

    public long int phonenumber[30];

    public void addindividual(string name1)

     {      

           If (i<=30)

            {     int flag=0;

                  for(int j=0; j<=i;j++)

                  {

                     if (strcmp(name[i], name1)

                      {

                          flag=1;

                      }

                     else

                     {  

                           flag=0;

                     }

                  }

                  If (flag)

                 {

                  if (i<30)

                  {

                  for(j=i+1;j<=30; j++)

                  {

                        cout<<"Enter the name:"; getchar(name[j]);

                        cout<<"Enter the phone number:"; cin>>phonenumber[j];

                         i++;

                   }

                  else  

                   {

                        cout<<"The person already exists";

                        exit();

                   }

              }

            else

             {

                 cout<<"array is full:";

                 exit();

             }

     }

}

Void main()

{

     string str;

    cout<<" Enter name:";

    getline(cin, str); ;

     citizen c1=new citizen();

     c1.addindividual(name1);

}

Explanation:

With a little more effort you can make the program allow the user to enter any number of details, but less than 30 overall. We have used here flag, and as a programmer we know why we use the Flag. It is used to check whether certain Boolean condition is fulfilled or not. Here, we are checking whether a given name is present in the array of names, and if it is not present, we add that to the list. And if the name is present, we print, it already exist.

4 0
3 years ago
For a list of numbers entered by the user and terminated by 0. Write a program to find the sum of the positive numbers and the s
Mumz [18]

Answer:

Following are the program in the Python Programming Language

#set variables to 0

positive_sum=0

negative_sum=0

#print message

print("Enter 0 to terminate")

#set the while loop

while(True):

 #get input from the user

 num=float(input("Enter positive or negative numbers: "))

 #set if statement to check condition

 if(num==0):

   break

 elif(num>0):

   positive_sum+=num

 else:

   negative_sum+=num

#print output with message

print()

print("sum of positive numbers: ", positive_sum)

print("sum of negative numbers: ", negative_sum)

<u>Output:</u>

Enter 0 to terminate

Enter positive or negative numbers: 1

Enter positive or negative numbers: 3

Enter positive or negative numbers: 5

Enter positive or negative numbers: -7

Enter positive or negative numbers: -2Enter positive or negative numbers: 0

sum of positive numbers:  9.0

sum of negative numbers:  -9.0

Explanation:

Here, we set two integer data type variables "positive_sum", "negative_sum" and initialize to 0.

Then, we set the while infinite loop inside the loop.

  • Set a variable "num" and get input from the user in it.
  • Set the if conditional statement and check condition the variable "num" is equal to 0 then, loop will terminate.
  • Set the elif statement and check condition the variable "num" is greater than 0 then, add that input and store in the variable "positive_sum"
  • Otherwise, add that input and store in the variable "negative_sum".

Finally, we print the output with the message.

6 0
4 years ago
Jim has just purchased two new SCSI hard disk drives and a controller card for them. He properly installs the hardware in his ma
yawa3891 [41]

Answer:

  • Create partitions on each hard disk drives.
  • Mount the partition created on each hard drive so they are accessible by the the operating system.
  • Format the partitions created with a filesystem recognized by Linux.

Explanation:

Having purchased the two new SCSI hard disk drives with the controller cards for each and installed them properly, before using them for data storage and retrieval he must first use the fdisk command to create one or more partitions on each of the hard disk drives then mount any partitions created on the two hard drives so that they are accessible by the operating system before then proceeding to format any partitions created with a valid filesystem recognized by Linux.

4 0
3 years ago
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