Solved lab

create.sql

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+-- create.sql
+-- Create database and all tables from scratch
+
+CREATE DATABASE IF NOT EXISTS lab_mysql;
+USE lab_mysql;
+
+-- Drop in child→parent order (disable FKs while dropping)
+SET FOREIGN_KEY_CHECKS = 0;
+DROP TABLE IF EXISTS invoices;
+DROP TABLE IF EXISTS salespersons;
+DROP TABLE IF EXISTS customers;
+DROP TABLE IF EXISTS cars;
+SET FOREIGN_KEY_CHECKS = 1;
+
+-- Parent tables
+CREATE TABLE cars (
+  id INT AUTO_INCREMENT PRIMARY KEY,
+  vin VARCHAR(32) NOT NULL,
+  manufacturer VARCHAR(50) NOT NULL,
+  model VARCHAR(80) NOT NULL,
+  year YEAR NOT NULL,
+  color VARCHAR(30) NOT NULL
+) ENGINE=InnoDB;
+
+CREATE TABLE customers (
+  id INT AUTO_INCREMENT PRIMARY KEY,
+  cust_id INT NOT NULL,
+  cust_name VARCHAR(100) NOT NULL,
+  cust_phone VARCHAR(30),
+  cust_email VARCHAR(255),
+  cust_address VARCHAR(255),
+  cust_city VARCHAR(100),
+  cust_state VARCHAR(100),
+  cust_country VARCHAR(100),
+  cust_zipcode VARCHAR(20)
+) ENGINE=InnoDB;
+
+CREATE TABLE salespersons (
+  id INT AUTO_INCREMENT PRIMARY KEY,
+  staff_id INT NOT NULL,
+  name VARCHAR(100) NOT NULL,
+  store VARCHAR(100)
+) ENGINE=InnoDB;
+
+-- Child table with FKs to the three parents
+CREATE TABLE invoices (
+  id INT AUTO_INCREMENT PRIMARY KEY,
+  invoice_number BIGINT NOT NULL,
+  invoice_date DATE NOT NULL,
+  car_id INT NOT NULL,
+  customer_id INT NOT NULL,
+  salesperson_id INT NOT NULL,
+  CONSTRAINT fk_invoices_car        FOREIGN KEY (car_id)        REFERENCES cars(id),
+  CONSTRAINT fk_invoices_customer   FOREIGN KEY (customer_id)   REFERENCES customers(id),
+  CONSTRAINT fk_invoices_salesperson FOREIGN KEY (salesperson_id) REFERENCES salespersons(id)
+) ENGINE=InnoDB;

seeding.sql

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+-- seeding.sql
+USE lab_mysql;
+
+-- Insert sample data (don’t set the auto-increment id; let MySQL assign 1,2,3…)
+INSERT INTO cars (vin, manufacturer, model, year, color) VALUES
+('3K096I98581DHSNUP', 'Volkswagen', 'Tiguan', 2019, 'Blue'),
+('ZM8G7BEUQZ97IH46V', 'Peugeot', 'Rifter', 2019, 'Red'),
+('RKXVNNIHLVVZOUB4M', 'Ford', 'Fusion', 2018, 'White'),
+('HKNDGS7CU31E9Z7JW', 'Toyota', 'RAV4', 2018, 'Silver'),
+('DAM41UDN3CHU2WVF6', 'Volvo', 'V60', 2019, 'Gray'),
+('DAM41UDN3CHU2WVF6', 'Volvo', 'V60 Cross Country', 2019, 'Gray');
+
+INSERT INTO customers (cust_id, cust_name, cust_phone, cust_email, cust_address, cust_city, cust_state, cust_country, cust_zipcode) VALUES
+(10001, 'Pablo Picasso', '+34 636 17 63 82', NULL, 'Paseo de la Chopera, 14', 'Madrid', 'Madrid', 'Spain', '28045'),
+(20001, 'Abraham Lincoln', '+1 305 907 7086', NULL, '120 SW 8th St', 'Miami', 'Florida', 'United States', '33130'),
+(30001, 'Napoléon Bonaparte', '+33 1 79 75 40 00', NULL, '40 Rue du Colisée', 'Paris', 'Île-de-France', 'France', '75008');
+
+INSERT INTO salespersons (staff_id, name, store) VALUES
+(1, 'Petey Cruiser', 'Madrid'),
+(2, 'Anna Sthesia', 'Barcelona'),
+(3, 'Paul Molive', 'Berlin'),
+(4, 'Gail Forcewind', 'Paris'),
+(5, 'Paige Turner', 'Mimia'),
+(6, 'Bob Frapples', 'Mexico City'),
+(7, 'Walter Melon', 'Amsterdam'),
+(8, 'Shonda Leer', 'São Paulo');
+
+-- The following INSERTs assume the ids assigned by AUTO_INCREMENT are:
+-- cars: 1..6 in the order inserted; customers: 1..3; salespersons: 1..8
+INSERT INTO invoices (invoice_number, invoice_date, car_id, customer_id, salesperson_id) VALUES
+(852399038, '2018-08-22', 1, 1, 3),
+(731166526, '2018-12-31', 3, 3, 5),
+(271135104, '2019-01-22', 2, 2, 7);

update&delete.sql

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+-- update.sql
+USE lab_mysql;
+
+-- Safe-update mode can block these; disable it if you get a warning.
+SET SQL_SAFE_UPDATES = 0;
+
+UPDATE customers SET cust_email = '[email protected]'
+WHERE cust_name = 'Pablo Picasso';
+
+UPDATE customers SET cust_email = '[email protected]'
+WHERE cust_name = 'Abraham Lincoln';
+
+UPDATE customers SET cust_email = '[email protected]'
+WHERE cust_name = 'Napoléon Bonaparte';
+-- delete.sql
+USE lab_mysql;
+
+-- The README asks to remove the entry with car ID #4.
+DELETE FROM cars
+WHERE id = 4;

verify.sql

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+USE lab_mysql;
+
+SELECT * FROM cars;
+SELECT * FROM customers;
+SELECT * FROM salespersons;
+SELECT * FROM invoices;
+
+-- After updates:
+SELECT cust_name, cust_email FROM customers;
+
+-- After delete:
+SELECT id, vin, manufacturer, model FROM cars ORDER BY id;