Jassif Team Institution

let mysql = require('mysql');

let con = mysql.createConnection({
  host: "localhost",
  user: "yourusername",
  password: "yourpassword",
  database: "mydb"
});

con.connect(function(err) {
  if (err) throw err;
  con.query("SELECT * FROM customers ORDER BY name", function (err, result) {
    if (err) throw err;
    console.log(result);
  });
});

C:\Users\Your Name>node demo_db_orderby.js

[
  { id: 3, name: 'Amy', address: 'Apple st 652'},
  { id: 11, name: 'Ben', address: 'Park Lane 38'},
  { id: 7, name: 'Betty', address: 'Green Grass 1'},
  { id: 13, name: 'Chuck', address: 'Main Road 989'},
  { id: 4, name: 'Hannah', address: 'Mountain 21'},
  { id: 1, name: 'John', address: 'Highway 71'},
  { id: 5, name: 'Michael', address: 'Valley 345'},
  { id: 2, name: 'Peter', address: 'Lowstreet 4'},
  { id: 8, name: 'Richard', address: 'Sky st 331'},
  { id: 6, name: 'Sandy', address: 'Ocean blvd 2'},
  { id: 9, name: 'Susan', address: 'One way 98'},
  { id: 10, name: 'Vicky', address: 'Yellow Garden 2'},
  { id: 14, name: 'Viola', address: 'Sideway 1633'},
  { id: 12, name: 'William', address: 'Central st 954'}
]

let mysql = require('mysql');

let con = mysql.createConnection({
  host: "localhost",
  user: "yourusername",
  password: "yourpassword",
  database: "mydb"
});

con.connect(function(err) {
  if (err) throw err;
  con.query("SELECT * FROM customers ORDER BY name DESC", function (err, result) {
    if (err) throw err;
    console.log(result);
  });
});

C:\Users\Your Name>node demo_db_orderby_desc.js

[
  { id: 12, name: 'William', address: 'Central st 954'},
  { id: 14, name: 'Viola', address: 'Sideway 1633'},
  { id: 10, name: 'Vicky', address: 'Yellow Garden 2'},
  { id: 9, name: 'Susan', address: 'One way 98'},
  { id: 6, name: 'Sandy', address: 'Ocean blvd 2'},
  { id: 8, name: 'Richard', address: 'Sky st 331'},
  { id: 2, name: 'Peter', address: 'Lowstreet 4'},
  { id: 5, name: 'Michael', address: 'Valley 345'},
  { id: 1, name: 'John', address: 'Highway 71'},
  { id: 4, name: 'Hannah', address: 'Mountain 21'},
  { id: 13, name: 'Chuck', address: 'Main Road 989'},
  { id: 7, name: 'Betty', address: 'Green Grass 1'},
  { id: 11, name: 'Ben', address: 'Park Lane 38'},
  { id: 3, name: 'Amy', address: 'Apple st 652'}
]

let mysql = require('mysql');

let con = mysql.createConnection({
  host: "localhost",
  user: "yourusername",
  password: "yourpassword",
  database: "mydb"
});

con.connect(function(err) {
  if (err) throw err;
  con.query("SELECT * FROM customers ORDER BY name ASC, address DESC", function (err, result) {
    if (err) throw err;
    console.log(result);
  });
});

// Multiple columns with different sort orders
con.query("SELECT * FROM products ORDER BY category ASC, price DESC, name ASC", function (err, result) {
  if (err) throw err;
  console.log(result);
});

// Order by calculated fields
con.query("SELECT *, (price * quantity) as total FROM orders ORDER BY total DESC", function (err, result) {
  if (err) throw err;
  console.log(result);
});

// Order by with WHERE clause
con.query("SELECT * FROM customers WHERE id > 5 ORDER BY name ASC", function (err, result) {
  if (err) throw err;
  console.log(result);
});

// Order by numeric column ascending
con.query("SELECT * FROM products ORDER BY price ASC", function (err, result) {
  if (err) throw err;
  console.log(result);
});

// Order by numeric column descending
con.query("SELECT * FROM products ORDER BY price DESC", function (err, result) {
  if (err) throw err;
  console.log(result);
});

// Order by calculated numeric value
con.query("SELECT *, (price * 0.9) as discounted_price FROM products ORDER BY discounted_price DESC", function (err, result) {
  if (err) throw err;
  console.log(result);
});

// Order by date ascending (oldest first)
con.query("SELECT * FROM orders ORDER BY order_date ASC", function (err, result) {
  if (err) throw err;
  console.log(result);
});

// Order by date descending (newest first)
con.query("SELECT * FROM orders ORDER BY order_date DESC", function (err, result) {
  if (err) throw err;
  console.log(result);
});

// Order by timestamp
con.query("SELECT * FROM logs ORDER BY created_at DESC", function (err, result) {
  if (err) throw err;
  console.log(result);
});

const mysql = require('mysql');

// Create connection
const con = mysql.createConnection({
  host: "localhost",
  user: "root",
  password: "password",
  database: "company_db"
});

// Connect to MySQL
con.connect((err) => {
  if (err) {
    console.error('Error connecting to MySQL:', err.message);
    return;
  }
  
  console.log('Connected to MySQL database');
  
  // Example 1: Basic ORDER BY ASC
  console.log('\n1. Customers ordered by name (ASC):');
  con.query("SELECT * FROM customers ORDER BY name ASC", (err, result) => {
    if (err) {
      console.error('Error in query 1:', err.message);
      return;
    }
    console.log(result);
  });
  
  // Example 2: ORDER BY DESC
  console.log('\n2. Customers ordered by name (DESC):');
  con.query("SELECT * FROM customers ORDER BY name DESC", (err, result) => {
    if (err) {
      console.error('Error in query 2:', err.message);
      return;
    }
    console.log(result);
  });
  
  // Example 3: Multiple column ordering
  console.log('\n3. Customers ordered by name ASC, address DESC:');
  con.query("SELECT * FROM customers ORDER BY name ASC, address DESC", (err, result) => {
    if (err) {
      console.error('Error in query 3:', err.message);
      return;
    }
    console.log(result);
  });
  
  // Example 4: ORDER BY with WHERE and LIMIT
  console.log('\n4. Top 5 customers with id > 5, ordered by name:');
  con.query(
    "SELECT * FROM customers WHERE id > 5 ORDER BY name ASC LIMIT 5",
    (err, result) => {
      if (err) {
        console.error('Error in query 4:', err.message);
        return;
      }
      console.log(result);
      
      // Close connection after all queries
      setTimeout(() => {
        con.end((err) => {
          if (err) {
            console.error('Error closing connection:', err.message);
            return;
          }
          console.log('\nConnection closed');
        });
      }, 1000);
    }
  );
});