Ivan week3 databases

.gitignore

@@ -4,4 +4,5 @@ node_modules/
 **/*-secret.json
 **/*.sh
 .idea
-.env
+.env
+test.js  

Week1/prep/prep-exe.sql

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+-- Очищаем существующие таблицы (для повторного запуска)
+DROP TABLE IF EXISTS recipe_methods;
+DROP TABLE IF EXISTS recipe_ingredients;
+DROP TABLE IF EXISTS recipe_categories;
+DROP TABLE IF EXISTS recipes;
+DROP TABLE IF EXISTS cooking_methods;
+DROP TABLE IF EXISTS ingredients;
+DROP TABLE IF EXISTS main_ingredients;
+DROP TABLE IF EXISTS categories;
+DROP TABLE IF EXISTS cuisines;
+
+---------------------------------------------------------
+-- 1. Таблица кухонь (Italian, Chinese, Japanese…)
+---------------------------------------------------------
+CREATE TABLE cuisines (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(100) NOT NULL UNIQUE
+);
+
+---------------------------------------------------------
+-- 2. Таблица основных ингредиентов (мясо, рыба, овощи)
+---------------------------------------------------------
+CREATE TABLE main_ingredients (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(150) NOT NULL UNIQUE
+);
+
+---------------------------------------------------------
+-- 3. Таблица всех возможных ингредиентов (морковь, масло, соль)
+---------------------------------------------------------
+CREATE TABLE ingredients (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(150) NOT NULL UNIQUE
+);
+
+---------------------------------------------------------
+-- 4. Таблица категорий (суп, салат, десерт, завтрак)
+---------------------------------------------------------
+CREATE TABLE categories (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(100) NOT NULL UNIQUE
+);
+
+---------------------------------------------------------
+-- 5. Таблица методов приготовления (жарка, запекание, варка)
+---------------------------------------------------------
+CREATE TABLE cooking_methods (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(100) NOT NULL UNIQUE
+);
+
+---------------------------------------------------------
+-- 6. Главная таблица рецептов
+---------------------------------------------------------
+CREATE TABLE recipes (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(255) NOT NULL,
+    cuisine_id INT,
+    main_ingredient_id INT,
+    FOREIGN KEY (cuisine_id) REFERENCES cuisines(id),
+    FOREIGN KEY (main_ingredient_id) REFERENCES main_ingredients(id)
+);
+
+---------------------------------------------------------
+-- 7. Связь рецепт ↔ категории (many-to-many)
+---------------------------------------------------------
+CREATE TABLE recipe_categories (
+    recipe_id INT NOT NULL,
+    category_id INT NOT NULL,
+    PRIMARY KEY (recipe_id, category_id),
+    FOREIGN KEY (recipe_id) REFERENCES recipes(id),
+    FOREIGN KEY (category_id) REFERENCES categories(id)
+);
+
+---------------------------------------------------------
+-- 8. Связь рецепт ↔ ингредиенты (many-to-many)
+---------------------------------------------------------
+CREATE TABLE recipe_ingredients (
+    recipe_id INT NOT NULL,
+    ingredient_id INT NOT NULL,
+    amount VARCHAR(50),  -- например "200 г", "1 ст.л."
+    PRIMARY KEY (recipe_id, ingredient_id),
+    FOREIGN KEY (recipe_id) REFERENCES recipes(id),
+    FOREIGN KEY (ingredient_id) REFERENCES ingredients(id)
+);
+
+---------------------------------------------------------
+-- 9. Связь рецепт ↔ методы приготовления (many-to-many)
+---------------------------------------------------------
+CREATE TABLE recipe_methods (
+    recipe_id INT NOT NULL,
+    method_id INT NOT NULL,
+    PRIMARY KEY (recipe_id, method_id),
+    FOREIGN KEY (recipe_id) REFERENCES recipes(id),
+    FOREIGN KEY (method_id) REFERENCES cooking_methods(id)
+);

Week2/prep/w1-prep-exe.sql

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+-- Очищаем существующие таблицы (для повторного запуска) -- Drop existing tables (for re-running the script)
+DROP TABLE IF EXISTS cuisines CASCADE;
+DROP TABLE IF EXISTS main_ingredients CASCADE;
+DROP TABLE IF EXISTS ingredients CASCADE;
+DROP TABLE IF EXISTS categories CASCADE;
+DROP TABLE IF EXISTS cooking_methods CASCADE;
+DROP TABLE IF EXISTS recipes CASCADE;
+DROP TABLE IF EXISTS recipe_categories CASCADE;
+DROP TABLE IF EXISTS recipe_ingredients CASCADE;
+DROP TABLE IF EXISTS recipe_methods CASCADE;
+DROP TABLE IF EXISTS recipe_ingredient_amounts CASCADE;
+
+
+
+---------------------------------------------------------
+-- 1. Таблица кухонь (Italian, Chinese, Japanese…) -- Table of Cuisines (Italian, Chinese, Japanese…)
+---------------------------------------------------------
+CREATE TABLE cuisines (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(100) NOT NULL UNIQUE
+);
+
+---------------------------------------------------------
+-- 2. Таблица основных ингредиентов (мясо, рыба, овощи) -- Table of Main Ingredients (meat, fish, vegetables)
+---------------------------------------------------------
+CREATE TABLE main_ingredients (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(150) NOT NULL UNIQUE
+);
+
+---------------------------------------------------------
+-- 3. Таблица всех возможных ингредиентов (морковь, масло, соль) -- Table of All Possible Ingredients (carrot, oil, salt)
+---------------------------------------------------------
+CREATE TABLE ingredients (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(150) NOT NULL UNIQUE
+);
+
+---------------------------------------------------------
+-- 4. Таблица категорий (суп, салат, десерт, завтрак) -- Table of Categories (soup, salad, dessert, breakfast)
+---------------------------------------------------------
+CREATE TABLE categories (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(100) NOT NULL UNIQUE
+);
+
+---------------------------------------------------------
+-- 5. Таблица методов приготовления (жарка, запекание, варка) -- Table of Cooking Methods (frying, baking, boiling)
+---------------------------------------------------------
+CREATE TABLE cooking_methods (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(100) NOT NULL UNIQUE
+);
+
+---------------------------------------------------------
+-- 6. Главная таблица рецептов -- Main Recipes Table
+---------------------------------------------------------
+CREATE TABLE recipes (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(255) NOT NULL,
+    cuisine_id INT,
+    main_ingredient_id INT,
+    FOREIGN KEY (cuisine_id) REFERENCES cuisines(id),
+    FOREIGN KEY (main_ingredient_id) REFERENCES main_ingredients(id)
+);
+
+---------------------------------------------------------
+-- 7. Связь рецепт ↔ категории (many-to-many) -- Recipe ↔ Categories Relationship (many-to-many)
+---------------------------------------------------------
+CREATE TABLE recipe_categories (
+    recipe_id INT NOT NULL,
+    category_id INT NOT NULL,
+    PRIMARY KEY (recipe_id, category_id),
+    FOREIGN KEY (recipe_id) REFERENCES recipes(id),
+    FOREIGN KEY (category_id) REFERENCES categories(id)
+);
+
+---------------------------------------------------------
+-- 8. Связь рецепт ↔ ингредиенты (many-to-many) -- Recipe ↔ Ingredients Relationship (many-to-many)
+---------------------------------------------------------
+CREATE TABLE recipe_ingredients (
+    recipe_id INT NOT NULL,
+    ingredient_id INT NOT NULL,
+    amount VARCHAR(50),  -- например "200 г", "1 ст.л."
+    PRIMARY KEY (recipe_id, ingredient_id),
+    FOREIGN KEY (recipe_id) REFERENCES recipes(id),
+    FOREIGN KEY (ingredient_id) REFERENCES ingredients(id)
+);
+
+---------------------------------------------------------
+-- 9. Связь рецепт ↔ методы приготовления (many-to-many) -- Recipe ↔ Cooking Methods Relationship (many-to-many)
+---------------------------------------------------------
+CREATE TABLE recipe_methods (
+    recipe_id INT NOT NULL,
+    method_id INT NOT NULL,
+    PRIMARY KEY (recipe_id, method_id),
+    FOREIGN KEY (recipe_id) REFERENCES recipes(id),
+    FOREIGN KEY (method_id) REFERENCES cooking_methods(id)
+);
+
+---------------------------------------------------------
+-- 10. кол-во ингредиентов в рецепте -- Quantity of Ingredients in Recipe
+---------------------------------------------------------
+CREATE TABLE recipe_ingredient_amounts (
+    recipe_id INT NOT NULL,
+    ingredient_id INT NOT NULL,
+    amount VARCHAR(50) NOT NULL,  -- например "200 г", "1 ст.л."
+    PRIMARY KEY (recipe_id, ingredient_id),
+    FOREIGN KEY (recipe_id) REFERENCES recipes(id),
+    FOREIGN KEY (ingredient_id) REFERENCES ingredients(id)
+);  

Week2/prep/w2-prep-insert-mok-data.sql

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+-- ==========================================
+-- Mock data inserts for Week 2 Prep Exercise
+-- ==========================================
+
+-- 1. Cuisines
+INSERT INTO cuisines (name) VALUES
+('Japanese')
+ON CONFLICT (name) DO NOTHING;
+
+-- 2. Main ingredients
+INSERT INTO main_ingredients (name) VALUES
+('Cheese'),
+('Vegetables'),
+('Pasta'),
+('Eggs')
+ON CONFLICT (name) DO NOTHING;
+
+-- 3. Categories
+INSERT INTO categories (name) VALUES
+('Cake'),
+('No-Bake'),
+('Vegetarian'),
+('Vegan'),
+('Gluten-Free'),
+('Japanese')
+ON CONFLICT (name) DO NOTHING;
+
+-- 4. Ingredients
+INSERT INTO ingredients (name) VALUES
+('Cheese'),
+('Vegetables'),
+('Pasta'),
+('Eggs'),
+('Condensed milk'),
+('Cream Cheese'),
+('Lemon Juice'),
+('Pie Crust'),
+('Cherry Jam'),
+('Brussels Sprouts'),
+('Sesame seeds'),
+('Pepper'),
+('Salt'),
+('Olive oil'),
+('Macaroni'),
+('Butter'),
+('Flour'),
+('Milk'),
+('Shredded Cheddar cheese'),
+('Soy sauce'),
+('Sugar')
+ON CONFLICT (name) DO NOTHING;
+
+-- 5. Recipes
+INSERT INTO recipes (name, cuisine_id, main_ingredient_id) VALUES
+('No-Bake Cheesecake', NULL, 1),
+('Roasted Brussels Sprouts', NULL, 2),
+('Mac & Cheese', NULL, 3),
+('Tamagoyaki Japanese Omelette', 1, 4)
+ON CONFLICT DO NOTHING;
+
+-- 6. Recipe ↔ Categories
+INSERT INTO recipe_categories (recipe_id, category_id) VALUES
+(1, 1), (1, 2), (1, 3),
+(2, 4), (2, 5),
+(3, 3),
+(4, 3), (4, 6)
+ON CONFLICT DO NOTHING;
+
+-- 7. Recipe ↔ Ingredients
+INSERT INTO recipe_ingredients (recipe_id, ingredient_id, amount) VALUES
+-- No-Bake Cheesecake
+(1, 5, '200 ml'),
+(1, 6, '250 g'),
+(1, 7, '1 tbsp'),
+(1, 8, '1 crust'),
+(1, 9, '2 tbsp'),
+-- Roasted Brussels Sprouts
+(2, 10, '500 g'),
+(2, 7, '1 tbsp'),
+(2, 11, '1 tsp'),
+(2, 12, '1 tsp'),
+(2, 13, '1 tsp'),
+(2, 14, '2 tbsp'),
+-- Mac & Cheese
+(3, 15, '200 g'),
+(3, 16, '50 g'),
+(3, 17, '2 tbsp'),
+(3, 13, '1 tsp'),
+(3, 12, '1 tsp'),
+(3, 18, '200 ml'),
+(3, 19, '150 g'),
+-- Tamagoyaki Japanese Omelette
+(4, 4, '4'),
+(4, 20, '1 tbsp'),
+(4, 21, '1 tsp'),
+(4, 13, '1 tsp'),
+(4, 14, '1 tbsp')
+ON CONFLICT DO NOTHING;

Week2/prep/w2-request.sql

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+-- 1. All vegetarian recipes with potatoes (но картошки нет в данных)
+SELECT r.name AS recipe_name
+FROM recipes r
+JOIN recipe_categories rc ON r.id = rc.recipe_id  
+JOIN categories c ON rc.category_id = c.id
+WHERE c.name = 'Vegetarian';
+
+-- 2. All cakes that do not need baking
+SELECT r.name AS recipe_name
+FROM recipes r
+JOIN recipe_categories rc1 ON r.id = rc1.recipe_id
+JOIN categories c1 ON rc1.category_id = c1.id
+JOIN recipe_categories rc2 ON r.id = rc2.recipe_id  
+JOIN categories c2 ON rc2.category_id = c2.id
+WHERE c1.name = 'Cake' AND c2.name = 'No-Bake';
+
+-- 3. All vegan and Japanese recipes
+SELECT r.name AS recipe_name
+FROM recipes r
+JOIN recipe_categories rc1 ON r.id = rc1.recipe_id
+JOIN categories c1 ON rc1.category_id = c1.id
+JOIN recipe_categories rc2 ON r.id = rc2.recipe_id
+JOIN categories c2 ON rc2.category_id = c2.id
+WHERE c1.name = 'Vegan' AND c2.name = 'Japanese';

Week3/assignment/3.1.md

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+QUESTIONS:
+1 - What columns violate 1NF?
+2 - What entities do you recognize that could be extracted?
+3 - Name all the tables and columns that would make a 3NF compliant solution.
+
+ANSWERS:
+1 - colums "food_code" and "food_description" - have the same problem. They have differebt data separated by comas
+2 - Members - Club members
+    Dinners - Dinners (events)
+    Venues - Venues
+    Foods - Foods
+
+Of cource for the real entities extraction we need more tables and info. HoweverHowever, for me personally, this is a tricky question, 
+because in my experience (outside of programming), we can manipulate data and play with definitions. So, theoretically.
+I'd classify the member address in the task as a property rather than an entity (based solely on the column names). 
+However, this isn't explicitly stated, so I can assume that an address is also an entity, just in a different context.
+
+3 - table: Members
+    columns: Member_id, Member_name, Member_address
+
+tables: Venues
+columns: Venue_code, Venue_description,
+
+tables: Foods
+columns: Food_code, Food_description
+
+tables: Dinners
+columns: Dinner_id, Dinner_date, venue_code
+
+tables: dinner_attendees 
+columns: Dinner_id, member_id
+
+tables: dinner_foods
+columns: Dinner_id, food_code