Ruba-week1-dataBases

Week1/Assignment/meetup.js

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+import { createConnection } from 'mysql2/promise';
+
+const connection = await createConnection({
+  host: 'localhost',
+  user: 'hyfuser',
+  password: 'hyfpassword',
+});
+
+const drop_database_query = `DROP DATABASE IF EXISTS meetup`;
+const create_database_query = `CREATE DATABASE meetup`;
+const use_database_query = `USE meetup`;
+
+const create_Invitee_query = `CREATE TABLE IF NOT EXISTS Invitee(
+  invitee_no INT AUTO_INCREMENT PRIMARY KEY,
+  invitee_name VARCHAR(255) NOT NULL,
+  invited_by VARCHAR(255) NOT NULL
+)`;
+
+const create_Room_query = `CREATE TABLE IF NOT EXISTS Room(
+  room_no INT AUTO_INCREMENT PRIMARY KEY,
+  room_name VARCHAR(255) NOT NULL,
+  floor_number INT NOT NULL
+)`;
+
+const create_Meeting_query = `CREATE TABLE IF NOT EXISTS Meeting(
+     meeting_no INT AUTO_INCREMENT PRIMARY KEY,
+     meeting_title VARCHAR(255) NOT NULL,
+     starting_time DATETIME NOT NULL,
+     ending_time DATETIME NOT NULL,
+     room_no INT,
+     FOREIGN KEY (room_no) REFERENCES Room(room_no)
+  )`;
+
+const insert_Invitee_query= `
+INSERT INTO Invitee (invitee_name, invited_by) VALUES
+('Ali', 'Bob'),
+('Ahmed', 'Ali'),
+('David', 'Ahmed'),
+('Salvatore','David'),
+('Frank', 'Emma')`;
+
+const insert_Room_query = `
+INSERT INTO Room (room_name, floor_number) VALUES
+('Conference Room A', 1),
+('Conference Room B', 2),
+('Main Hall', 1),
+('Meeting Room 1', 3),
+('Meeting Room 2', 3)`;
+
+const insert_Meeting_query = `
+INSERT INTO Meeting (meeting_title, starting_time, ending_time, room_no) VALUES
+('Project Kickoff', '2024-12-17 09:00:00', '2024-12-17 10:30:00', 1),
+('Team Standup', '2024-12-17 11:00:00', '2024-12-17 11:30:00', 2),
+('Budget Planning', '2024-12-17 13:00:00', '2024-12-17 14:30:00', 3),
+('Strategy Meeting', '2024-12-17 15:00:00', '2024-12-17 16:30:00', 4),
+('Client Presentation', '2024-12-18 10:00:00', '2024-12-18 11:30:00', 5)`;
+
+await connection.query(drop_database_query);
+await connection.query(create_database_query);
+await connection.query(use_database_query);
+
+await connection.query(create_Invitee_query);
+await connection.query(create_Room_query);
+await connection.query(create_Meeting_query);
+
+await connection.query(insert_Invitee_query);
+await connection.query(insert_Room_query);
+await connection.query(insert_Meeting_query);
+
+connection.end();

Week1/Assignment/world_query.js

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+import { createConnection } from 'mysql2/promise';
+
+const connection = await createConnection({
+  host: 'localhost',
+  user: 'hyfuser',
+  password: 'hyfpassword',
+  database: 'world', 
+});
+
+
+try {
+    const select_population_query = `SELECT name FROM country WHERE population > 8000000`;
+    const [query1] = await connection.query(select_population_query);
+    console.log('Countries with population greater than 8 million:');
+    console.log(query1);
+
+    const select_land_query = `SELECT name FROM country WHERE name LIKE "%land%"`;
+    const [query2] = await connection.query(select_land_query);
+    console.log('Countries with "land" in their names:');
+    console.log(query2);
+
+    const select_city_query = `SELECT name FROM city WHERE population BETWEEN 500000 AND 1000000`;
+    const [query3] = await connection.query(select_city_query);
+    console.log('Cities with population between 500,000 and 1 million:');
+    console.log(query3);
+
+    const select_Europe_query = `SELECT name FROM country WHERE continent = "Europe"`;
+    const [query4] = await connection.query(select_Europe_query);
+    console.log('Countries in Europe:');
+    console.log(query4);
+
+    const select_areas_query = `SELECT name FROM country ORDER BY surfaceArea DESC`;
+    const [query5] = await connection.query(select_areas_query);
+    console.log('Countries ordered by surface area (descending):');
+    console.log(query5);
+
+    const select_NLD_query = `SELECT name FROM city WHERE countryCode = "NLD"`;
+    const [query6] = await connection.query(select_NLD_query);
+    console.log('Cities in the Netherlands:');
+    console.log(query6);
+
+    const select_Rotterdam_query = `SELECT population FROM city WHERE name = "Rotterdam"`;
+    const [query7] = await connection.query(select_Rotterdam_query);
+    console.log('Population of Rotterdam:');
+    console.log(query7);
+
+    const select_LIMIT10_query = `SELECT name FROM country ORDER BY surfaceArea DESC LIMIT 10`;
+    const [query8] = await connection.query(select_LIMIT10_query);
+    console.log('Top 10 countries by surface area:');
+    console.log(query8);
+
+    const select_mostPopulation_query = `SELECT name FROM city ORDER BY population DESC LIMIT 10`;
+    const [query9] = await connection.query(select_mostPopulation_query);
+    console.log('Top 10 most populated cities:');
+    console.log(query9);
+
+    const select_sumPopulation_query = `SELECT SUM(population) AS world_population FROM country`;
+    const [query10] = await connection.query(select_sumPopulation_query);
+    console.log('World population:');
+    console.log(query10);
+
+  } catch (error) {
+    console.error('Error executing queries:', error.message);
+  } finally {
+    await connection.end();
+  }