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Author: Nevena797

02 table_relations_exer/01. primary_key.sql

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+CREATE TABLE
+	products (
+	product_name VARCHAR(100)
+);
+INSERT INTO products
+VALUES
+		('Broccoli')
+		,('Shampoo')
+		,('Toothpaste')
+		,('Candy');
+
+ALTER TABLE
+	products
+ADD COLUMN
+	"id" SERIAL PRIMARY KEY;

02 table_relations_exer/02. remove_primary_key.sql

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+ALTER TABLE
+	products
+DROP CONSTRAINT products_pkey;

02 table_relations_exer/03. customs.sql

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+CREATE TABLE IF NOT EXISTS passports (
+	id INTEGER GENERATED ALWAYS AS IDENTITY (START WITH 100 INCREMENT 1) PRIMARY KEY,
+	nationality VARCHAR(50)
+);
+
+INSERT INTO
+	passports(nationality)
+VALUES
+	('N34FG21B')
+	, ('K65LO4R7')
+	, ('ZE657QP2');
+
+CREATE TABLE people (
+	id SERIAL PRIMARY KEY
+	, first_name VARCHAR(50)
+	, salary DECIMAL(10, 2)
+	, passport_id INT
+
+	, CONSTRAINT fk_people_passports
+	FOREIGN KEY (passport_id)
+	REFERENCES passports(id)
+);
+
+INSERT INTO
+	people (first_name, salary, passport_id)
+VALUES
+	('Roberto', 43300.00, 101)
+	, ('Tom', 56100.00, 102)
+	, ('Yana', 60200.00, 100);

02 table_relations_exer/04. car_manufacture.sql

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+CREATE TABLE manufacturers (
+	id SERIAL PRIMARY KEY
+	, name VARCHAR(50)
+);
+
+CREATE TABLE models (
+	id INT GENERATED ALWAYS AS IDENTITY (START 1000 INCREMENT 1) PRIMARY KEY
+	, model_name VARCHAR(50)
+	, manufacturer_id INT
+
+	,CONSTRAINT fk_models_manufacturers
+	FOREIGN KEY (manufacturer_id)
+	REFERENCES manufacturers(id)
+);
+
+CREATE TABLE production_years (
+	id SERIAL PRIMARY KEY
+	, established_on DATE
+	, manufacturer_id INT
+
+	, CONSTRAINT fk_production_years_manufacturers
+	FOREIGN KEY (manufacturer_id)
+	REFERENCES manufacturers(id)
+);
+
+INSERT INTO
+	manufacturers(name)
+VALUES
+	('BMW')
+	, ('Tesla')
+	, ('Lada');
+
+INSERT INTO
+	models(model_name, manufacturer_id)
+VALUES
+	('X1', 1)
+	, ('i6', 1)
+	, ('Model S', 2)
+	, ('Model X', 2)
+	, ('Model 3', 2)
+	, ('Nova', 3)
+;
+
+INSERT INTO
+	production_years(established_on, manufacturer_id)
+VALUES
+	('1916-03-01', 1)
+	, ('2003-01-01', 2)
+	, ('1966-05-01', 3)
+;

02 table_relations_exer/06. photo_shooting.sql

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+CREATE TABLE customers (
+	id SERIAL PRIMARY KEY
+	, name VARCHAR(50)
+	, date DATE
+);
+
+CREATE TABLE photos (
+	id SERIAL PRIMARY KEY
+	, url VARCHAR(50)
+	, place VARCHAR(50)
+	, customer_id INT
+
+	, CONSTRAINT fk_photos_customers
+	FOREIGN KEY (customer_id)
+	REFERENCES customers(id)
+);
+
+INSERT INTO
+	customers(name, date)
+VALUES
+	('Bella', '2022-03-25')
+	, ('Philip', '2022-07-05')
+;
+
+
+INSERT INTO
+	photos(url, place, customer_id)
+VALUES
+	('bella_1111.com', 'National Theatre', 1)
+	, ('bella_1112.com', 'Largo', 1)
+	, ('bella_1113.com', 'The View Restaurant', 1)
+	, ('philip_1121.com', 'Old Town', 2)
+	, ('philip_1122.com', 'Rowing Canal', 2)
+	, ('philip_1123.com', 'Roman Theater', 2)
+;

02 table_relations_exer/08. study_session.sql

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+CREATE TABLE students (
+	id SERIAL PRIMARY KEY
+	, student_name VARCHAR(50)
+);
+
+CREATE TABLE exams (
+	id INT GENERATED ALWAYS AS IDENTITY (START 101 INCREMENT 1) PRIMARY KEY
+	, exam_name VARCHAR(50)
+);
+
+CREATE TABLE study_halls (
+	id SERIAL PRIMARY KEY
+	, study_hall_name VARCHAR(50)
+	, exam_id INT
+
+	, CONSTRAINT fk_study_halls_exams
+	FOREIGN KEY (exam_id)
+	REFERENCES exams(id)
+);
+
+CREATE TABLE students_exams (
+	student_id INT
+	, exam_id INT
+
+	, CONSTRAINT pk_students_exams
+	PRIMARY KEY (student_id, exam_id)
+
+	, CONSTRAINT fk_students_exams_students
+	FOREIGN KEY (student_id)
+	REFERENCES students(id)
+
+	, CONSTRAINT fk_students_exams_exams
+	FOREIGN KEY (exam_id)
+	REFERENCES exams(id)
+);
+
+
+INSERT INTO
+	students(student_name)
+VALUES
+	('Mila')
+	, ('Toni')
+	, ('Ron');
+
+INSERT INTO
+	exams(exam_name)
+VALUES
+	('Python Advanced')
+	, ('Python OOP')
+	, ('PostgreSQL');
+
+INSERT INTO
+	study_halls(study_hall_name, exam_id)
+VALUES
+	('Open Source Hall', 102)
+	, ('Inspiration Hall', 101)
+	, ('Creative Hall', 103)
+	, ('Masterclass Hall', 103)
+	, ('Information Security Hall', 103);;
+
+INSERT INTO
+	students_exams
+VALUES
+	(1, 101)
+	, (1, 102)
+	, (2, 101)
+	, (3, 103)
+	, (2, 102)
+	, (2, 103);;

02 table_relations_exer/10. online_store.sql

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+CREATE TABLE item_types (
+	id SERIAL PRIMARY KEY
+	, item_type_name VARCHAR(50)
+);
+
+CREATE TABLE cities (
+	id SERIAL PRIMARY KEY
+	, city_name VARCHAR(50)
+);
+
+CREATE TABLE items (
+	id SERIAL PRIMARY KEY
+	, item_name VARCHAR(40)
+	, item_type_id INT
+
+	, CONSTRAINT fk_items_item_types
+	FOREIGN KEY (item_type_id)
+	REFERENCES item_types(id)
+);
+
+CREATE TABLE customers (
+	id SERIAL PRIMARY KEY
+	, customer_name VARCHAR(100)
+	, birthday DATE
+	, city_id INT
+
+	, CONSTRAINT fk_customers_cities
+	FOREIGN KEY (city_id)
+	REFERENCES cities(id)
+);
+
+CREATE TABLE orders (
+	id SERIAL PRIMARY KEY
+	, customer_id INT
+
+	, CONSTRAINT fk_orders_customers
+	FOREIGN KEY (customer_id)
+	REFERENCES customers(id)
+);
+
+
+CREATE TABLE order_items (
+	order_id INT
+	, item_id INT
+
+	, CONSTRAINT pk_order_items
+	PRIMARY KEY (order_id, item_id)
+
+	, CONSTRAINT fk_order_items_orders
+	FOREIGN KEY (order_id)
+	REFERENCES orders(id)
+
+	, CONSTRAINT fk_order_items_items
+	FOREIGN KEY (item_id)
+	REFERENCES items(id)
+);

02 table_relations_exer/11. delete_cascade.sql

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+ALTER TABLE
+	countries
+ADD CONSTRAINT
+	fk_countries_continents
+FOREIGN KEY
+	(continent_code)
+REFERENCES continents(continent_code)
+ON DELETE CASCADE;
+
+ALTER TABLE
+	countries
+ADD CONSTRAINT
+	fk_countries_currencies
+FOREIGN KEY
+	(currency_code)
+REFERENCES
+	currencies(currency_code)
+ON DELETE CASCADE;

02 table_relations_exer/12. update_cascade.sql

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+ALTER TABLE
+	countries_rivers
+
+ADD CONSTRAINT
+	fk_countries_rivers_rivers
+FOREIGN KEY
+	(river_id)
+REFERENCES
+	rivers(id)
+ON UPDATE CASCADE
+
+, ADD CONSTRAINT
+	fk_countries_rivers_countries
+FOREIGN KEY
+	(country_code)
+REFERENCES
+	countries(country_code)
+ON UPDATE CASCADE;

02 table_relations_exer/13. set_null.sql

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+CREATE TABLE customers (
+	ID SERIAL PRIMARY KEY
+	, customer_name VARCHAR(50)
+);
+
+CREATE TABLE contacts (
+	ID SERIAL PRIMARY KEY
+	, contact_name VARCHAR(50)
+	, phone VARCHAR(50)
+	, email VARCHAR (50)
+	, customer_id INT
+
+	, CONSTRAINT fk_contacts_customers
+	FOREIGN KEY (customer_id)
+	REFERENCES customers(id)
+	ON DELETE SET NULL
+	ON UPDATE CASCADE
+);
+
+INSERT INTO
+	customers(customer_name)
+VALUES
+	('BlueBird Inc')
+	, ('Dolphin LLC');
+
+INSERT INTO
+	contacts(customer_id, contact_name, phone, email)
+VALUES
+	(1,'John Doe','(408)-111-1234','john.doe@bluebird.dev')
+    , (1,'Jane Doe','(408)-111-1235','jane.doe@bluebird.dev')
+    , (2,'David Wright','(408)-222-1234','david.wright@dolphin.dev');
+
+DELETE FROM
+	customers
+WHERE
+	id = 1;