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3 years ago

Major innovation made from establishment of abacus to the development of fifth dev of computer generation

Computers and Technology

1 answer:

expeople1 [14]3 years ago

7 0

Explanation:

The establishment of the Abacus brought about one of the first counting device (calculator). This device was a mechanized computer that supported numeric calculations. However, the process was entirely manual and mechanized. This innovation led to;

First-generation of computers, although not entirely manually operated like Abacus, made use of vacuum tubes, were very big in size and could store only a small amount of information.

Second Generation of computers unlike the first generation that uses vacuum tubes, this one came with new technology; the use of transistors. The computers were smaller in size than vacuum tubes.

Third Generation computers made use of IC (Integrated circuits) for the first time. Contained higher storage capacity and was more reliable than previous generations.

Fourth Generation computers became known as the personal computer generation. This generation brought the use of personal computers on a personal level as they use microprocessors, was easy to carry about, had larger storage capacity and faster speed of operations.

Fifth-generation of computers is known as the age of artificial intelligence. These computers were programmed with the ability to make decisions just like a human being would.

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Write a SELECT statement that returns one row for each customer that has orders with these columns:

d1i1m1o1n [39]

Answer:

SELECT email_address,

SUM(item_price * Quantity) AS item_price_total,

SUM(discount_amount * Quantity) AS discount_amount_total

FROM Customers c

JOIN Orders o ON c.CustomerID = o.CustomerID

JOIN Order_Items oi ON o.OrderID = oi.OrderID

GROUP BY email_address

ORDER BY item_price_total DESC

Explanation:

In this SQL statement the SELECT statement selects the following columns:

email_address

item_price

Quantity

discount_amount

There are two tables Customers and Order_Items

SUM aggregate function is used to add the values of the product of the columns discount_amount and Quantity. It is also used to get the sum of the product of two columns discount_amount and Quantity.

A new temporary column named item_price_total is used to name the sum of the product of two columns discount_amount and Quantity using AS which is ALIAS and it is used to give a name to some columns or a table.

Similarly discount_amount_total name is given to the column which calculate the sum of the product of two columns i.e. discount_amount and Quantity.

JOIN is used here to join the columns from the tables Order_items and Customers.

GROUP BY is used to group the result of rows and is used with functions like SUM. Here the rows are grouped by the email address.

ORDER BY is used to order the result. Here the result is ordered by item_price_total in descending order.

This SELECT statement can also be written as following:

SELECT c.email_address,

SUM(o.item_price * o.Quantity),

SUM(o.discount_amount * o.quantity)

FROM customer c

JOIN Order_Items o ON o.id = c.id

GROUP BY c.email_address

7 0

3 years ago

Design a GUI program as follows: The program will open up a window that contains a read-only text box and 2 buttons. One button

Marizza181 [45]

Answer:

Kindly note that, you're to replace "at" with shift 2 as the brainly text editor can't accept the symbol

Explanation:

A graphical user interface (GUI) allows a user to interact with a computer program using a pointing device that manipulates small pictures on a computer screen. The small pictures are called icons or widgets. Various types of pointing devices can be used, such as a mouse, a stylus pen, or a human finger on a touch screen

import java.awt.Color;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class LuckyButtons {

static JFrame frame = new JFrame("Lucky Buttons");

static JPanel panel = new JPanel();

public static void main(String s[]) {

panel.setLayout(null);

final JTextField txt1 = new JTextField(10);

txt1.setBounds(200, 50, 100, 30);

// password field

final JTextField txt2 = new JTextField(10);

txt2.setBounds(320, 50, 100, 30);

txt1.setEnabled(false);

txt2.setEnabled(false);

JButton btn1 = new JButton();

btn1.setText("I feel lucky! :)");

btn1.setBounds(200, 150, 130, 20);

JButton btn2 = new JButton();

btn2.setText("I don't feel lucky :(");

btn2.setBounds(350, 150, 150, 20);

btn1.addActionListener(new ActionListener() {

"at"Override

public void actionPerformed(ActionEvent aE) {

txt1.setText("I feel lucky! :)");

txt2.setText("I feel lucky! :)");

panel.setBackground(Color.red);

}

});

btn2.addActionListener(new ActionListener() {

"at"Override

public void actionPerformed(ActionEvent aE) {

txt1.setText("I don't feel lucky :(");

txt2.setText("I don't feel lucky :(");

panel.setBackground(Color.white);

}

});

panel.add(txt1);

panel.add(txt2);

panel.add(btn1);

panel.add(btn2);

frame.add(panel);

frame.setSize(600, 300);

frame.setLocationRelativeTo(null);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

Kindly check the attached image below for the code output.

6 0

3 years ago

being able to download a chapter of a new book before buying it or trying out a software option for a month before purchasing ar

Natasha_Volkova [10]

Answer:

Experience the product

Explanation:

Being able to download a chapter of a new book before purchasing it is an example of how consumers can experience the product.

6 0

3 years ago

Which of the following would NOT be considered an agricultural pest?

Komok [63]

A dog laying amongst the crops would not be a pest, so the correct choice would be the first one.

4 0

3 years ago

Read 2 more answers

_____ is(are) often used in reports to quickly represent data and help the readers understand the data.

Ira Lisetskai [31]

Tables are used to present numerical data in a wide variety of publications from newspapers, journals and textbooks to the sides of grocery packets.

6 0

3 years ago