diff --git a/ERD_for_lab.mwb b/ERD_for_lab.mwb
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diff --git a/LAB2SQL.sql b/LAB2SQL.sql
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+-- Challenge 1
+create database lab;
+use lab
+
+CREATE TABLE articless (
+    author VARCHAR(100),
+    title VARCHAR(255),
+    word_count INT,
+    views INT
+);
+
+INSERT INTO articless (author, title, word_count, views) VALUES
+('Maria Charlotte', 'Best Paint Colors', 814, 14),
+('Juan Perez', 'Small Space Decorating Tips', 1146, 221),
+('Maria Charlotte', 'Hot Accessories', 986, 105),
+('Maria Charlotte', 'Mixing Textures', 765, 22),
+('Juan Perez', 'Kitchen Refresh', 1242, 307),
+('Maria Charlotte', 'Homemade Art Hacks', 1002, 193),
+('Gemma Alcocer', 'Refinishing Wood Floors', 1571, 7542);
+
+
+-- Solution 1 
+-- i made 2 (authors and Articles) table for 3NF 
+CREATE TABLE authors (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    name VARCHAR(100) NOT NULL
+);
+select * from articles;
+drop table articles;
+INSERT INTO authors (name) VALUES 
+('Maria Charlotte'), 
+('Juan Perez'), 
+('Gemma Alcocer'); 
+
+CREATE TABLE articles (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    author_id INT,
+    title VARCHAR(255),
+    word_count INT,
+    views INT,
+    FOREIGN KEY (author_id) REFERENCES authors(id)
+);
+
+INSERT INTO articles (author_id, title, word_count, views) VALUES
+(1, 'Best Paint Colors', 814, 14),
+(2, 'Small Space Decorating Tips', 1146, 221),
+(1, 'Hot Accessories', 986, 105),
+(1, 'Mixing Textures', 765, 22),
+(2, 'Kitchen Refresh', 1242, 307),
+(1, 'Homemade Art Hacks', 1002, 193),
+(3, 'Refinishing Wood Floors', 1571, 7542);
+
+-- it is for testing 
+SELECT 
+    a.name AS author, 
+    art.title, 
+    art.word_count, 
+    art.views
+FROM articles art
+INNER JOIN authors a ON art.author_id = a.id;
+
+-- Challenge 2
+
+CREATE TABLE flight_bookings (
+    customer_name VARCHAR(50),
+    customer_status ENUM('NONE', 'SILVER', 'GOLD'),
+    flight_number VARCHAR(10),
+    aircraft VARCHAR(50) ,
+    total_aircraft_seats INT,
+    flight_mileage INT,
+    total_customer_mileage INT
+);
+INSERT INTO flight_bookings (
+    customer_name, 
+    customer_status, 
+    flight_number, 
+    aircraft, 
+    total_aircraft_seats, 
+    flight_mileage, 
+    total_customer_mileage
+) VALUES
+('Agustine Riviera', 'Silver', 'DL143', 'Boeing 747', 400, 135, 115235),
+('Agustine Riviera', 'Silver', 'DL122', 'Airbus A330', 236, 4370, 115235),
+('Alaina Sepulvida', 'None', 'DL122', 'Airbus A330', 236, 4370, 6008),
+('Agustine Riviera', 'Silver', 'DL143', 'Boeing 747', 400, 135, 115235),
+('Tom Jones', 'Gold', 'DL122', 'Airbus A330', 236, 4370, 205767),
+('Tom Jones', 'Gold', 'DL53', 'Boeing 777', 264, 2078, 205767),
+('Agustine Riviera', 'Silver', 'DL143', 'Boeing 747', 400, 135, 115235),
+('Sam Rio', 'None', 'DL143', 'Boeing 747', 400, 135, 2653),
+('Agustine Riviera', 'Silver', 'DL143', 'Boeing 747', 400, 135, 115235),
+('Tom Jones', 'Gold', 'DL222', 'Boeing 777', 264, 1765, 205767),
+('Jessica James', 'Silver', 'DL143', 'Boeing 747', 400, 135, 127656),
+('Sam Rio', 'None', 'DL143', 'Boeing 747', 400, 135, 2653),
+('Ana Janco', 'Silver', 'DL222', 'Boeing 777', 264, 1765, 136773),
+('Jennifer Cortez', 'Gold', 'DL222', 'Boeing 777', 264, 1765, 300582),
+('Jessica James', 'Silver', 'DL122', 'Airbus A330', 236, 4370, 127656),
+('Sam Rio', 'None', 'DL37', 'Boeing 747', 400, 531, 2653),
+('Christian Janco', 'Silver', 'DL222', 'Boeing 777', 264, 1765, 14642);
+
+CREATE TABLE customers(
+customer_id INT AUTO_INCREMENT PRIMARY KEY,
+name varchar(50),
+status ENUM ('NONE','SILVER','GOLD'),
+total_milage INT
+);
+
+CREATE TABLE flights (
+    flight_id INT AUTO_INCREMENT PRIMARY KEY,
+    flight_number VARCHAR(10) UNIQUE,
+    flight_mileage INT
+);
+
+CREATE TABLE aircrafts (
+    aircraft_id INT AUTO_INCREMENT PRIMARY KEY,
+    model VARCHAR(50) UNIQUE,
+    total_seats INT
+);
+
+CREATE TABLE bookings (
+    booking_id INT AUTO_INCREMENT PRIMARY KEY,
+    customer_id INT,
+    flight_id INT,
+    aircraft_id INT,
+    FOREIGN KEY (customer_id) REFERENCES customers(customer_id),
+    FOREIGN KEY (flight_id) REFERENCES flights(flight_id),
+    FOREIGN KEY (aircraft_id) REFERENCES aircrafts(aircraft_id)
+);
+
+-- Challenge 3 
+-- 1
+SELECT COUNT(DISTINCT flight_number) FROM flights;
+-- 2
+SELECT AVG(mileage) FROM flights;
+-- 3 
+SELECT AVG(total_seats) FROM aircrafts;
+-- 4
+SELECT status, AVG(total_mileage) FROM customers GROUP BY status;
+-- 5 
+SELECT status, MAX(total_mileage) FROM customers GROUP BY status;
+-- 6 
+SELECT COUNT(*) FROM aircrafts WHERE name LIKE '%Boeing%';
+-- 7 
+SELECT * FROM flights WHERE mileage BETWEEN 300 AND 2000;
+-- 8 
+SELECT c.status, AVG(f.mileage)
+FROM bookings b
+JOIN customers c ON b.customer_id = c.id
+JOIN flights f ON b.flight_number = f.flight_number
+GROUP BY c.status;
+-- 9 
+SELECT a.name, COUNT(*) AS total_bookings
+FROM bookings b
+JOIN customers c ON b.customer_id = c.id
+JOIN flights f ON b.flight_number = f.flight_number
+JOIN aircrafts a ON f.aircraft_id = a.id
+WHERE c.status = 'Gold'
+GROUP BY a.name
+ORDER BY total_bookings DESC
+LIMIT 1;
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