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Sergio [31]
3 years ago
7

What is your impression on the subject fundamentals of database systems?​

Computers and Technology
1 answer:
frozen [14]3 years ago
8 0

Answer:

The DBMS software enables users to share data. It provides a systematic method of creating, updating, retrieving and storing information in a database. DBMSs also are generally responsible for data integrity, data access control, and automated rollback, restart and recovery

   Database Fundamentals introduces database concepts, including relational databases, tables and data types, data selection and manipulation, views, stored procedures, functions, normalization, constraints, indexes, security, and backup and restore.

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maybe

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2 years ago
Describe one activity that belongs to the organizing phase software engineering.
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Answer:

can you be more specific

Explanation:

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3 years ago
Read 2 more answers
Tracy has a file that contains a list of actors and the movies in which they acted. She wants to know the top 3 ranked actors fr
harina [27]

Answer:

{

private String name;

private String review;

/** Constructs a ProductReview object and initializes the instance variables. */

public ProductReview(String pName, String pReview)

{

name = pName;

review = pReview;

}

/** Returns the name of the product. */

public String getName()

{ return name; }

/** Returns the review of the product. */

public String getReview()

{ return review; }

}

The ReviewCollector class, shown below, is used to represent a collection of reviews to be analyzed.

public class ReviewCollector

{

private ArrayList<ProductReview> reviewList;

private ArrayList<String> productList;

/** Constructs a ReviewCollector object and initializes the instance variables. */

public ReviewCollector()

{

reviewList = new ArrayList<ProductReview>();

productList = new ArrayList<String>();

}

/** Adds a new review to the collection of reviews, as described in part (a). */

public void addReview(ProductReview prodReview)

{ /* to be implemented in part (a) */ }

/** Returns the number of good reviews for a given product name, as described in part (b). */

public int getNumGoodReviews(String prodName)

{ /* to be implemented in part (b) */ }

// There may be instance variables, constructors, and methods not shown.

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3 0
3 years ago
Write a function that returns a chessboard pattern ("B" for black squares, "W" for white squares). The function takes a number N
Kryger [21]

Answer:

Here is the C++ program.

#include <iostream>  //to use input output functions

using namespace std;  // to access objects like cin cout

 

void chessboard(int N){  // function that takes a number N as parameter generates corresponding board

   int i, j;  

   string black = "B";  // B for black squares

   string white = "W"; // W for white squares

   for(i=1;i<=N;i++){  //iterates through each column of the board

       for(j=1;j<=N;j++){  //iterates through each row of the board

           if((i+j)%2==0)  // if sum of i and j is completely divisible by 2

               cout<<black<<" ";  //displays B when above if condition is true

           else  //if (i+j)%2 is not equal to 0

           cout<<white<<" ";  }  // displays W when above if condition is false

      cout<<endl;    }    }  //prints the new line

       

int main(){    //start of the main function

   int num;  //declares an integer num

   cout << "Enter an integer representing the size of the chessboard: ";  //prompts user to enter size of chess board

   cin >> num;  //reads value of num from user

   chessboard(num); } //calls chessboard function to display N lines consist of N space-separated characters representing the chessboard pattern

Explanation:

The function works as follows:

Lets say that N = 2

two string variables black and white are declared. The value of black is set to "B" and value of white is set to "W" to return a chessboard pattern in B and W squares.

The outer loop for(i=1;i<=N;i++) iterates through each column of the chess board. The inner loop  for(j=1;j<=N;j++) iterates through each row of chess board.

At first iteration of outer loop:

N = 2

outer loop:

i=1

i<=N is true because i=1 and 1<=2

So the program enters the body of the outer for loop. It has an inner for loop:

for(j=1;j<=N;j++)

At first iteration of inner loop:

j = 1

j<=N is true because j=1 and 1<=2

So the program enters the body of the inner for loop. It has an if statement:

if((i+j)%2==0) this statement works as:

if(1+1) % 2 == 0

(1+1 )% 2 takes the mod of 1+1 with 2 which gives the remainder of the division.

2%2 As 2 is completely divisible by 2 so 2%2 == 0

Hence the if condition evaluates to true. So the statement in if part executes:

cout<<black<<" ";

This prints B on the output screen with a space.

B

The value of j is incremented to 1.

j = 2

At second iteration of inner loop:

j = 2

j<=N is true because j=2 and 2=2

So the program enters the body of the inner for loop. It has an if statement:

if((i+j)%2==0) this statement works as:

if(1+2) % 2 == 0

(1+2 )% 2 takes the mod of 1+2 with 2 which gives the remainder of the division.

3%2 As 3 is not completely divisible by 2

Hence the if condition evaluates to false. So the statement in else part executes:

cout<<white<<" ";

This prints W on the output screen with a space.

B W

The value of j is incremented to 1.

j = 3

Now  

j<=N is false because j=3 and 3>2

So the loop breaks and program moves to the outer loop to iterate through the next row.

At second iteration of outer loop:

N = 2

outer loop:

i=2

i<=N is true because i=2 and 2 = 2

So the program enters the body of the outer for loop. It has an inner for loop:

for(j=1;j<=N;j++)

At first iteration of inner loop:

j = 1

j<=N is true because j=1 and 1<=2

So the program enters the body of the inner for loop. It has an if statement:

if((i+j)%2==0) this statement works as:

if(2+1) % 2 == 0

(2+1 )% 2 takes the mod of 2+1 with 2 which gives the remainder of the division.

3%2 As 3 is not completely divisible by 2

Hence the if condition evaluates to false. So the statement in else part executes:

cout<<white<<" ";

This prints W on the output screen with a space.

B W

W

The value of j is incremented to 1.

j = 2

At second iteration of inner loop:

j = 2

j<=N is true because j=2 and 2=2

So the program enters the body of the inner for loop. It has an if statement:

if((i+j)%2==0) this statement works as:

if(2+2) % 2 == 0

(2+2 )% 2 takes the mod of 2+2 with 2 which gives the remainder of the division.

4%2 As 4 is completely divisible by 2 so 4%2 == 0

Hence the if condition evaluates to false. So the statement in if part executes:

cout<<black<<" ";

This prints B on the output screen with a space.

B W

W B

The value of j is incremented to 1.

j = 3

Now  

j<=N is false because j=3 and 3>2

So the loop breaks and program moves to the outer loop. The value of outer loop variable i is incremented to 1 so i = 3

N = 2

outer loop:

i=3

i<=N is false because i=3 and 3>2

So this outer loop ends.

Now the output of this program is:

B W

W B

Screenshot of this program along with its output is attached.

8 0
3 years ago
Explain briefly why the discovery phase is a favorite with many developers
Mamont248 [21]

Answer:

Discovery phase is the beginning step of a system development work. It is an important step for our professional staff, as people will need the information gathered to make informed technical advice for the construction effort and to provide an exact cost assessment.

Explanation:

Discovery regulates our organization with the customer’s requirements at the origin. The exercises and deliverables of outline Discovery are essential to the correctness of design evaluation and preparation, and we suggest that they always are completed for complicated custom requests with unknown and unsteady technical elements.

3 0
3 years ago
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