Ilias_Khugaev-w1-Databases

Week1/databases/assigment/meetup.js

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+import mysql from 'mysql2/promise';
+
+// Create the connection to database
+const connection = await mysql.createConnection({
+  host: 'localhost',
+  user: 'hyfuser',
+  password: 'hyfpassword'
+});
+
+connection.connect();
+
+try {
+    await connection.query('CREATE DATABASE IF NOT EXISTS meetup');
+    await connection.query('USE meetup');
+    await connection.query('CREATE TABLE Invitee (invitee_no INT NOT NULL PRIMARY KEY, invitee_name VARCHAR(25) NOT NULL, invited_by VARCHAR(25))');
+    await connection.query('CREATE TABLE Room (room_no INT NOT NULL PRIMARY KEY, room_name VARCHAR(25) NOT NULL, floor_number INT NOT NULL)');
+    await connection.query('CREATE TABLE Meeting (meeting_no INT NOT NULL PRIMARY KEY, meeting_title VARCHAR(40) NOT NULL, staring_time DATETIME, ending_time DATETIME, room_no INT NOT NULL)');
+
+    await connection.query('INSERT INTO Invitee VALUES (1, "Ilias Khugaev", "Ilia Bubnov")');
+    await connection.query('INSERT INTO Invitee VALUES (2, "Anna Petrova", "Ilias Khugaev")');
+    await connection.query('INSERT INTO Invitee VALUES (3, "Dmitry Sokolov", "Anna Petrova")');
+    await connection.query('INSERT INTO Invitee VALUES (4, "Maria Ivanova", "Dmitry Sokolov")');
+    await connection.query('INSERT INTO Invitee VALUES (5, "Oleg Smirnov", "Maria Ivanova")');
+
+    await connection.query('INSERT INTO Room VALUES (1, "Orion", 1)');
+    await connection.query('INSERT INTO Room VALUES (2, "Pegasus", 1)');
+    await connection.query('INSERT INTO Room VALUES (3, "Centauri", 2)');
+    await connection.query('INSERT INTO Room VALUES (4, "Andromeda", 2)');
+    await connection.query('INSERT INTO Room VALUES (5, "Phoenix", 3)');
+
+    await connection.query('INSERT INTO Meeting VALUES (1, "Project Kickoff", "2025-05-21 09:00:00", "2025-05-21 10:00:00", 1)');
+    await connection.query('INSERT INTO Meeting VALUES (2, "Design Review", "2025-05-21 10:30:00", "2025-05-21 11:30:00", 2)');
+    await connection.query('INSERT INTO Meeting VALUES (3, "Sprint Planning", "2025-05-21 12:00:00", "2025-05-21 13:00:00", 3)');
+    await connection.query('INSERT INTO Meeting VALUES (4, "Client Sync", "2025-05-21 14:00:00", "2025-05-21 15:00:00", 4)');
+    await connection.query('INSERT INTO Meeting VALUES (5, "Retrospective", "2025-05-21 16:00:00", "2025-05-21 17:00:00", 5)');
+
+} catch (error) {
+     console.log(error);
+}
+
+connection.end();

Week1/databases/assigment/world.js

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+import mysql from 'mysql2/promise';
+
+// Create the connection to database
+const connection = await mysql.createConnection({
+  host: 'localhost',
+  user: 'hyfuser',
+  password: 'hyfpassword'
+});
+
+connection.connect();
+
+try {
+    await connection.query('USE new_world');
+// What are the names of countries with population greater than 8 million 
+    await connection.query('SELECT name FROM country WHERE population > 8000000');
+// What are the names of countries that have “land” in their names?
+    await connection.query('SELECT name FROM country WHERE name LIKE "%land%"');
+// What are the names of the cities with population in between 500,000 and 1 million?
+    await connection.query('SELECT name FROM city WHERE population BETWEEN 500000 AND 1000000');
+// What's the name of all the countries on the continent ‘Europe’?
+    await connection.query('SELECT name FROM country WHERE Continent = "Europe"');
+// List all the countries in the descending order of their surface areas.
+    await connection.query('SELECT name FROM country ORDER BY SurfaceArea DESC');
+// What are the names of all the cities in the Netherlands?
+    await connection.query('SELECT name FROM city WHERE CountryCode = "NLD"');
+// What is the population of Rotterdam?
+    await connection.query('SELECT name, Population FROM city WHERE name = "Rotterdam"');
+// What's the top 10 countries by Surface Area?
+    await connection.query('SELECT name FROM country ORDER BY SurfaceArea LIMIT DESC 10');
+// What's the top 10 most populated cities?
+    await connection.query('SELECT name, Population FROM city ORDER BY population DESC LIMIT 10');
+// What is the population number of the world?
+    await connection.query('SELECT SUM(Population) FROM country');
+
+} catch (error) {
+    console.error(error);
+}
+
+connection.end();