Solved lab

create.sql

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+-- create.sql — Challenge 2
+CREATE DATABASE IF NOT EXISTS lab_mysql
+  DEFAULT CHARACTER SET utf8mb4
+  DEFAULT COLLATE utf8mb4_unicode_ci;
+
+USE lab_mysql;
+
+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;
+
+-- Cars
+CREATE TABLE cars (
+  id           INT AUTO_INCREMENT PRIMARY KEY,
+  vin          VARCHAR(32)  NOT NULL,
+  manufacturer VARCHAR(100) NOT NULL,
+  model        VARCHAR(100) NOT NULL,
+  `year`       SMALLINT     NOT NULL,
+  color        VARCHAR(50)
+) ENGINE=InnoDB;
+
+
+-- Customers
+CREATE TABLE customers (
+  id           INT AUTO_INCREMENT PRIMARY KEY,
+  cust_id      VARCHAR(20)   NOT NULL,
+  cust_name    VARCHAR(150)  NOT NULL,
+  cust_phone   VARCHAR(50),
+  cust_email   VARCHAR(150),
+  cust_address VARCHAR(200),
+  cust_city    VARCHAR(100),
+  cust_state   VARCHAR(100),
+  cust_country VARCHAR(100),
+  cust_zipcode VARCHAR(20),
+  UNIQUE KEY uq_customers_cust_id (cust_id),
+  UNIQUE KEY uq_customers_email (cust_email)
+) ENGINE=InnoDB;
+
+-- Salespersons 
+CREATE TABLE salespersons (
+  id       INT AUTO_INCREMENT PRIMARY KEY,
+  staff_id VARCHAR(20)  NOT NULL,
+  name     VARCHAR(150) NOT NULL,
+  store    VARCHAR(100),
+  UNIQUE KEY uq_salespersons_staff_id (staff_id)
+) ENGINE=InnoDB;
+
+-- Invoices 
+CREATE TABLE invoices (
+  id              INT AUTO_INCREMENT PRIMARY KEY,
+  invoice_number  VARCHAR(30) NOT NULL,
+  `date`          DATE        NOT NULL,
+  car_id          INT         NOT NULL,
+  customer_id     INT         NOT NULL,
+  salesperson_id  INT         NOT NULL,
+
+  UNIQUE KEY uq_invoices_invoice_number (invoice_number),
+
+  KEY idx_invoices_car_id        (car_id),
+  KEY idx_invoices_customer_id   (customer_id),
+  KEY idx_invoices_salesperson_id(salesperson_id),
+
+  CONSTRAINT fk_invoices_car
+    FOREIGN KEY (car_id) REFERENCES cars(id)
+    ON UPDATE CASCADE ON DELETE RESTRICT,
+
+  CONSTRAINT fk_invoices_customer
+    FOREIGN KEY (customer_id) REFERENCES customers(id)
+    ON UPDATE CASCADE ON DELETE RESTRICT,
+
+  CONSTRAINT fk_invoices_salesperson
+    FOREIGN KEY (salesperson_id) REFERENCES salespersons(id)
+    ON UPDATE CASCADE ON DELETE RESTRICT
+) ENGINE=InnoDB;

seeding.sql

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+-- seeding.sql — Challenge 3
+USE lab_mysql;
+
+SET FOREIGN_KEY_CHECKS = 0;
+TRUNCATE TABLE invoices;
+TRUNCATE TABLE salespersons;
+TRUNCATE TABLE customers;
+TRUNCATE TABLE cars;
+SET FOREIGN_KEY_CHECKS = 1;
+
+-- Cars 
+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');
+
+-- Customers
+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');
+
+-- Salespersons
+INSERT INTO salespersons (staff_id, name, store) VALUES
+('00001','Petey Cruiser','Madrid'),
+('00002','Anna Sthesia','Barcelona'),
+('00003','Paul Molive','Berlin'),
+('00004','Gail Forcewind','Paris'),
+('00005','Paige Turner','Miami'),
+('00006','Bob Frapples','Mexico City'),
+('00007','Walter Melon','Amsterdam'),
+('00008','Shonda Leer','São Paulo');
+
+-- Invoices
+INSERT INTO invoices (invoice_number, `date`, car_id, customer_id, salesperson_id) VALUES
+('852399038','2018-08-22',
+  (SELECT id FROM cars        WHERE vin='3K096I98581DHSNUP' LIMIT 1),
+  (SELECT id FROM customers   WHERE cust_id='10001'        LIMIT 1),
+  (SELECT id FROM salespersons WHERE staff_id='00003'      LIMIT 1)),
+('731166526','2018-12-31',
+  (SELECT id FROM cars        WHERE vin='RKXVNNIHLVVZOUB4M' LIMIT 1),
+  (SELECT id FROM customers   WHERE cust_id='30001'         LIMIT 1),
+  (SELECT id FROM salespersons WHERE staff_id='00005'       LIMIT 1)),
+('271135104','2019-01-22',
+  (SELECT id FROM cars        WHERE vin='ZM8G7BEUQZ97IH46V' LIMIT 1),
+  (SELECT id FROM customers   WHERE cust_id='20001'         LIMIT 1),
+  (SELECT id FROM salespersons WHERE staff_id='00007'       LIMIT 1));
+
+-- Quick checks
+SELECT COUNT(*) AS n_cars FROM cars;
+SELECT COUNT(*) AS n_customers FROM customers;
+SELECT COUNT(*) AS n_salespersons FROM salespersons;
+SELECT COUNT(*) AS n_invoices FROM invoices;
+
+SELECT i.invoice_number, i.`date`,
+       c.manufacturer, c.model, c.`year`,
+       cust.cust_name, sp.name AS salesperson
+FROM invoices i
+JOIN cars c         ON i.car_id = c.id
+JOIN customers cust ON i.customer_id = cust.id
+JOIN salespersons sp ON i.salesperson_id = sp.id;

update.sql

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+-- seeding.sql — Challenge 3
+USE lab_mysql;
+
+SET FOREIGN_KEY_CHECKS = 0;
+TRUNCATE TABLE invoices;
+TRUNCATE TABLE salespersons;
+TRUNCATE TABLE customers;
+TRUNCATE TABLE cars;
+SET FOREIGN_KEY_CHECKS = 1;
+
+-- Cars 
+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');
+
+-- Customers
+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');
+
+-- Salespersons
+INSERT INTO salespersons (staff_id, name, store) VALUES
+('00001','Petey Cruiser','Madrid'),
+('00002','Anna Sthesia','Barcelona'),
+('00003','Paul Molive','Berlin'),
+('00004','Gail Forcewind','Paris'),
+('00005','Paige Turner','Miami'),
+('00006','Bob Frapples','Mexico City'),
+('00007','Walter Melon','Amsterdam'),
+('00008','Shonda Leer','São Paulo');
+
+-- Invoices
+INSERT INTO invoices (invoice_number, `date`, car_id, customer_id, salesperson_id) VALUES
+('852399038','2018-08-22',
+  (SELECT id FROM cars        WHERE vin='3K096I98581DHSNUP' LIMIT 1),
+  (SELECT id FROM customers   WHERE cust_id='10001'        LIMIT 1),
+  (SELECT id FROM salespersons WHERE staff_id='00003'      LIMIT 1)),
+('731166526','2018-12-31',
+  (SELECT id FROM cars        WHERE vin='RKXVNNIHLVVZOUB4M' LIMIT 1),
+  (SELECT id FROM customers   WHERE cust_id='30001'         LIMIT 1),
+  (SELECT id FROM salespersons WHERE staff_id='00005'       LIMIT 1)),
+('271135104','2019-01-22',
+  (SELECT id FROM cars        WHERE vin='ZM8G7BEUQZ97IH46V' LIMIT 1),
+  (SELECT id FROM customers   WHERE cust_id='20001'         LIMIT 1),
+  (SELECT id FROM salespersons WHERE staff_id='00007'       LIMIT 1));
+
+-- Quick checks
+SELECT COUNT(*) AS n_cars FROM cars;
+SELECT COUNT(*) AS n_customers FROM customers;
+SELECT COUNT(*) AS n_salespersons FROM salespersons;
+SELECT COUNT(*) AS n_invoices FROM invoices;
+
+SELECT i.invoice_number, i.`date`,
+       c.manufacturer, c.model, c.`year`,
+       cust.cust_name, sp.name AS salesperson
+FROM invoices i
+JOIN cars c         ON i.car_id = c.id
+JOIN customers cust ON i.customer_id = cust.id
+JOIN salespersons sp ON i.salesperson_id = sp.id;