a) A.3/4 -hp motor has a 3-p, 30 -A rated combination magnetic motor starter
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Draw the schema mapping (logical database design) for the following part of ER diagram for train station database. When appropriate use the foreign key option.
The verbal description of the schema mapping is one whose drawing should have:
Tables: consisting of TrainStation:Train: consisting of train_id (Primary Key) and train_nameSchedule: consisting of schedule_id (Primary Key)RelationshipsWhat is the logical database designThis 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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Which statement about ROM is true?
The statement "ROM is a non-volatile memory" is true of ROM.
What is 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.
b) Use a main method from the JOptionPane to request values from the user to initialize the instance variables of Election objects and assign these objects to the array. The array must be filled.
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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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.
You can use SQL syntax to create a table for the "books" entity in a library management system. See attached.
What is a library management system?A library management system is a software application or platform designed to facilitate the efficient organization, management, and automation of library operations.
It helps libraries streamline tasks such as cataloging, borrowing, returning, and tracking books and other library resources.
It also enables functions like user management, inventory management, and generating reports for analysis and decision-making.
Note that the above is used for a database system.
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To create a table for a database, I wiould use the CREATE TABLE funtion. That is CREATE TABLE Book. The INSERT function would be used to alter the table to add a new column. iINSERT INTO Books (authorID, text).
How to write an SQL queryTo write an SQL query, the writer first has to input the functions for different instructions. if you wish to create a new table, the CREATE TABLE fnction would be used.
If you wish to put new information, INSERT INTO will be used an if you want to retrieve information, Select function woud be used.
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