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feat: solved 1st stage of the Hyperskill project "Electronics Store Customer"
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‎hyperskill/16_electronics_store_customer/01/README.md

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# Objectives
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Identify the `pc_code`, `model`, `speed`, and `ram` of PCs from the `market` database with 16 GB of RAM or more.
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Ensure the results are sorted primarily by `ram` in ascending order and secondarily by `speed` in descending order.
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The column order is essential.
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```sql
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SELECT pc_code, model, speed, ram
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FROM PC
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WHERE ram >= 16
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ORDER BY ram ASC, speed DESC;
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```

‎hyperskill/16_electronics_store_customer/01/Updated_Electronic_Store_Database.sql

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DROP TABLE IF EXISTS PC;
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DROP TABLE IF EXISTS Laptop;
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DROP TABLE IF EXISTS Printer;
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DROP TABLE IF EXISTS Product;
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-- Create the Product table
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CREATE TABLE Product (
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maker VARCHAR(50) NOT NULL,
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model INT NOT NULL,
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type VARCHAR(50) NOT NULL,
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PRIMARY KEY (model)
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);
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-- Create the PC table
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CREATE TABLE PC (
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pc_code INT NOT NULL,
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model INT NOT NULL,
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speed INT NOT NULL,
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ram INT NOT NULL,
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hd INT NOT NULL,
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cd VARCHAR(50) NOT NULL,
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price DECIMAL(10, 2) NOT NULL,
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PRIMARY KEY (pc_code),
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FOREIGN KEY (model) REFERENCES Product(model) -- Define the foreign key relationship
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);
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-- Create the Laptop table
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CREATE TABLE Laptop (
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laptop_code INT NOT NULL,
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model INT NOT NULL,
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speed INT NOT NULL,
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ram INT NOT NULL,
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hd INT NOT NULL,
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screen INT NOT NULL,
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price DECIMAL(10, 2) NOT NULL,
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PRIMARY KEY (laptop_code),
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FOREIGN KEY (model) REFERENCES Product(model) -- Define the foreign key relationship
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);
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-- Create the Printer table
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CREATE TABLE Printer (
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printer_code INT NOT NULL,
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model INT NOT NULL,
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color CHAR(1) NOT NULL,
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type VARCHAR(50) NOT NULL,
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price DECIMAL(10, 2) NOT NULL,
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PRIMARY KEY (printer_code),
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FOREIGN KEY (model) REFERENCES Product(model) -- Define the foreign key relationship
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);
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INSERT INTO Product (model, maker, type)
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VALUES
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(101, 'Sony', 'Laptop'),
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(102, 'Sony', 'PC'),
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(103, 'HP', 'Printer'),
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(104, 'LG', 'Laptop'),
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(105, 'LG', 'PC'),
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(106, 'Konica Minolta', 'Printer'),
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(107, 'Samsung', 'Laptop'),
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(108, 'IBM', 'PC'),
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(109, 'Sony', 'PC'),
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(110, 'Xerox', 'Printer');
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INSERT INTO PC (pc_code, model, speed, ram, hd, cd, price)
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VALUES
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(201, 102, 2800, 8, 1000, 'DVD', 799.99),
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(202, 105, 3200, 16, 2000, 'Blu-ray', 1299.99),
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(203, 108, 2400, 4, 500, 'None', 549.99),
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(204, 109, 2600, 8, 1000, 'DVD', 699.99),
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(205, 102, 3500, 32, 1500, 'DVD', 1399.99),
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(206, 105, 2900, 8, 1000, 'DVD', 749.99),
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(207, 102, 2700, 4, 500, 'None', 599.99),
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(208, 109, 2800, 8, 1000, 'DVD', 699.99),
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(209, 102, 3300, 16, 2000, 'Blu-ray', 1199.99),
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(210, 105, 2600, 4, 500, 'DVD', 539.99);
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INSERT INTO Laptop (laptop_code, model, speed, ram, hd, screen, price)
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VALUES
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(301, 101, 2500, 8, 512, 13, 1299.99),
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(302, 104, 2800, 16, 1000, 15, 1599.99),
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(303, 107, 2400, 4, 256, 14, 799.99),
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(304, 101, 2700, 16, 512, 13, 1399.99),
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(305, 107, 2600, 8, 512, 14, 1199.99),
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(306, 101, 2300, 4, 256, 13, 999.99),
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(307, 107, 2500, 8, 512, 14, 1299.99),
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(308, 101, 2900, 16, 1000, 15, 1699.99),
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(309, 104, 2600, 8, 512, 14, 1299.99),
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(310, 107, 4700, 32, 256, 16, 1999.99);
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INSERT INTO Printer (printer_code, model, color, type, price)
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VALUES
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(401, 106, 'C', 'Inkjet', 249.99),
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(402, 103, 'B', 'Laser', 129.99),
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(403, 110, 'C', 'Laser', 299.99),
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(404, 103, 'B', 'Matrix', 139.99),
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(405, 103, 'C', 'Laser', 199.99),
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(406, 106, 'B', 'Inkjet', 119.99),
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(407, 103, 'C', 'Inkjet', 179.99),
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(408, 106, 'B', 'Laser', 109.99),
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(409, 110, 'C', 'Matrix', 279.99),
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(410, 103, 'B', 'Inkjet', 129.99),
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(411, 106, 'C', 'Inkjet', 169.99)
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;

‎hyperskill/16_electronics_store_customer/README.md

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# Electronics Store Customer
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My solution to the project [Electronics Store Customer](https://hyperskill.org/projects/382?track=40) on [Hyperskill](https://hyperskill.org).
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Each stage of the project is in a separate folder.

‎hyperskill/README.md

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There are no certificates for this track yet.
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## Essential Skills for Backend Developers
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## Essential Skills for Backend Developers Track
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[My](https://hyperskill.org/profile/7889902) solutions to [Hyperskill](https://hyperskill.org) projects from the [Essential Skills for Backend Developers](https://hyperskill.org/tracks/50) track.
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| [Dolly](./15_dolly) | Challenging | Completed |
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My [certificate](https://hyperskill.org/certificates/2d7f557a-0541-4721-92a5-d1d35c1c2033.pdf) of completion of the track.
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## SQL for Backend Developers Track
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[My](https://hyperskill.org/profile/7889902) solutions to [Hyperskill](https://hyperskill.org) projects from the [SQL for Backend Developers](https://hyperskill.org/tracks/40) track.
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| Project | Level | Status |
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| ------------------------------------------------------------- | ----- | ----------- |
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| [Electronics Store Customer](./16_electronics_store_customer) | Easy | In Progress |
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My [certificate](TODO:) of completion of the track.

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