Suppose you are creating a database for a library management system. Explain how you would create a table for the "books" entity and insert some sample data, and then alter the table to add a new column for the "authorID" attribute and update “authorID” with some data. Finally, write a SQL query to retrieve all the books that were published after the year 2000.
Note that this book schema has several columns, including "book_id" as the primary key, "title", "authorN", "publisher", "publication_year", "isbn", "language", and "num_pages". It also includes "available" column that is set to "true" by default and can be used to track the availability of the book.

The statement "ROM is a non-volatile memory" is true of ROM.

ROM, an acronym for Read-Only Memory, denotes a form of memory that solely permits reading operations, devoid of any writing capability. It serves the purpose of preserving programs and data that are indispensable for initializing a computer system, such as the BIOS (Basic Input/Output System).

The BIOS, an application securely residing in ROM, carries out the crucial task of loading the operating system into the computer's RAM upon powering it on.

ROM essentially comprises an arrangement of transistors, organized in a grid-like structure. Each transistor possesses the ability to exist in either an activated or deactivated state. The intricate arrangement of these activated and deactivated transistors symbolizes the specific data that is immutably stored within ROM.

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Complete question:

Which statement about ROM is true?

(i) It is a volatile memory.

(ii) It is a non-volatile memory.

(iii) It is both a volatile and a non-volatile memory.

Below is an example code snippet for this process:

```javaimport javax.swing.JOptionPane;public class ElectionDemo {

public static void main(String[] args) {

Election[] elections = new Election[3];for(int i = 0; i < elections.length; i++) {

String name = JOptionPane.showInputDialog("Enter name of candidate: ");

int votes = Integer.parseInt(JOptionPane.showInputDialog("Enter number of votes: "));

Election e = new Election(name, votes);elections[i] = e;}

for(Election e : elections) {System.out.println(e.getName() + " received " + e.getVotes() + " votes.");

}

}

} ```

The above code snippet is a simple example that uses the JOptionPane to prompt the user to input values for the instance variables of an Election object. Here, we create an array of three Election objects and then use a for loop to initialize each object.

The for loop is a standard loop that iterates through each object in the array.Inside the for loop, we use the JOptionPane to prompt the user to input values for the name and votes variables. The input values are then used to create a new Election object, which is assigned to the current position in the array.

Finally, we use another for loop to print out the name and votes variables for each Election object in the array.

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The verbal description of the schema mapping is one whose drawing should have:

This mapping schema is one that shows the interconnectedness of train schedules, trains and train stations. This feature enables you to save details regarding train stations, trains, and their schedules, which include the precise times of departure and arrival at given stations

.

To have a graphic depiction of this schema mapping, you have the option to utilize a database modeling application like Lucidchart, draw. io, or any comparable tool that facilitates the construction of ER diagrams or logical database layouts.

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