Week1 Homework - Meetup database setup

Week1/Hadidreem17/setup_meetup_db.js

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+const { Client } = require("pg");
+
+async function main() {
+const client = new Client({
+  user: "hyfuser",
+  host: "localhost",
+  database: "postgres",
+  password: "hyfpassword",
+  port: 5432,
+});
+
+  await client.connect();
+
+  console.log("Dropping database if exists...");
+  await client.query("DROP DATABASE IF EXISTS meetup");
+
+  console.log("Creating database meetup...");
+  await client.query("CREATE DATABASE meetup");
+
+  await client.end();
+
+
+  const meetupClient = new Client({
+  user: "hyfuser",
+  host: "localhost",
+  database: "meetup",
+  password: "hyfpassword",
+  port: 5432,
+});
+
+  await meetupClient.connect();
+
+  console.log("Creating tables...");
+
+  await meetupClient.query(`
+    CREATE TABLE Invitee (
+      invitee_no SERIAL PRIMARY KEY,
+      invitee_name VARCHAR(100),
+      invited_by VARCHAR(100)
+    );
+  `);
+
+  await meetupClient.query(`
+    CREATE TABLE Room (
+      room_no SERIAL PRIMARY KEY,
+      room_name VARCHAR(100),
+      floor_number INT
+    );
+  `);
+
+  await meetupClient.query(`
+    CREATE TABLE Meeting (
+      meeting_no SERIAL PRIMARY KEY,
+      meeting_title VARCHAR(200),
+      starting_time TIMESTAMP,
+      ending_time TIMESTAMP,
+      room_no INT REFERENCES Room(room_no)
+    );
+  `);
+
+  console.log("Inserting sample data...");
+
+  await meetupClient.query(`
+    INSERT INTO Invitee (invitee_name, invited_by) VALUES
+    ('Sara', 'Ali'),
+    ('John', 'Lina'),
+    ('Maya', 'Omar'),
+    ('Noor', 'Samir'),
+    ('Adam', 'Lara');ssss
+  `);
+
+  await meetupClient.query(`
+    INSERT INTO Room (room_name, floor_number) VALUES
+    ('Blue Room', 1),
+    ('Red Room', 2),
+    ('Green Room', 1),
+    ('Orange Room', 3),
+    ('VIP Room', 5);
+  `);
+
+  await meetupClient.query(`
+    INSERT INTO Meeting (meeting_title, starting_time, ending_time, room_no) VALUES
+    ('Tech Meetup', NOW(), NOW() + INTERVAL '2 hours', 1),
+    ('Startup Pitch', NOW(), NOW() + INTERVAL '1 hour', 2),
+    ('Workshop JS', NOW(), NOW() + INTERVAL '3 hours', 3),
+    ('Design Basics', NOW(), NOW() + INTERVAL '4 hours', 4),
+    ('AI Conference', NOW(), NOW() + INTERVAL '5 hours', 5);
+  `);
+
+  console.log("All done");
+  await meetupClient.end();
+}
+
+main();

Week1/Hadidreem17/world_queries.js

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+const { Client } = require("pg");
+
+async function main() {
+  const client = new Client({
+    user: "hyfuser",
+  host: "localhost",
+    database: "world",
+    password: "hyfpassword",
+    port: 5432,
+  });
+
+  try {
+    await client.connect();
+
+    console.log("\n1. Countries with population > 8 million:");
+    let result = await client.query(`
+      SELECT name FROM country WHERE population > 8000000;
+    `);
+    console.log(result.rows);
+
+    console.log("\n2. Countries that contain 'land' in their names:");
+    result = await client.query(`
+      SELECT name FROM country WHERE name ILIKE '%land%';
+    `);
+    console.log(result.rows);
+
+    console.log("\n3. Cities with population between 500k and 1 million:");
+    result = await client.query(`
+      SELECT name FROM city
+      WHERE population BETWEEN 500000 AND 1000000;
+    `);
+    console.log(result.rows);
+
+    console.log("\n4. Countries in Europe:");
+    result = await client.query(`
+      SELECT name FROM country WHERE continent = 'Europe';
+    `);
+    console.log(result.rows);
+
+    console.log("\n5. Countries ordered by surface area DESC:");
+    result = await client.query(`
+      SELECT name, surfacearea FROM country ORDER BY surfacearea DESC;
+    `);
+    console.log(result.rows);
+
+    console.log("\n6. All cities in the Netherlands:");
+    result = await client.query(`
+      SELECT name FROM city WHERE countrycode = 'NLD';
+    `);
+    console.log(result.rows);
+
+    console.log("\n7. Population of Rotterdam:");
+    result = await client.query(`
+      SELECT population FROM city WHERE name = 'Rotterdam';
+    `);
+    console.log(result.rows);
+
+    console.log("\n8. Top 10 countries by surface area:");
+    result = await client.query(`
+      SELECT name, surfacearea FROM country ORDER BY surfacearea DESC LIMIT 10;
+    `);
+    console.log(result.rows);
+
+    console.log("\n9. Top 10 most populated cities:");
+    result = await client.query(`
+      SELECT name, population FROM city ORDER BY population DESC LIMIT 10;
+    `);
+    console.log(result.rows);
+
+    console.log("\n10. Total population of the world:");
+    result = await client.query(`
+      SELECT SUM(population) AS world_population FROM country;
+    `);
+    console.log(result.rows);
+
+  } catch (err) {
+    console.error("Error while running queries:", err);
+  } finally {
+    await client.end();
+  }
+}
+
+main();