complete Restaurant Database Management System implementation

database.sql

@@ -8,7 +8,10 @@
 -- 5. Insert at least 3 menu items.
 -- 6. The script should be executable from start to finish without errors.
 
-
+DROP TABLE IF EXISTS order_details CASCADE;
+DROP TABLE IF EXISTS orders CASCADE;
+DROP TABLE IF EXISTS menu_items CASCADE;
+DROP TABLE IF EXISTS users CASCADE;
 
 -- =======================================================
 -- USER TABLE
@@ -30,6 +33,12 @@
 --
 -- CREATE TABLE ...
 
+CREATE TABLE users (
+    id SERIAL PRIMARY KEY,
+    username VARCHAR(50) NOT NULL UNIQUE,
+    password VARCHAR(255) NOT NULL,
+    email VARCHAR(100)
+);
 
 
 -- =======================================================
@@ -52,7 +61,13 @@
 --
 -- CREATE TABLE ...
 
-
+CREATE TABLE menu_items (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(100) NOT NULL,
+    description TEXT,
+    price DECIMAL(10, 2) NOT NULL CHECK (price > 0),
+    category VARCHAR(50)
+);
 
 -- =======================================================
 -- ORDER TABLE
@@ -77,7 +92,13 @@
 --
 -- CREATE TABLE ...
 
-
+CREATE TABLE orders (
+    id SERIAL PRIMARY KEY,
+    user_id INT NOT NULL,
+    order_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    total_amount DECIMAL(10, 2) NOT NULL DEFAULT 0.00 CHECK (total_amount >= 0),
+    CONSTRAINT fk_order_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+    );
 
 -- =======================================================
 -- ORDER DETAIL TABLE
@@ -100,7 +121,15 @@
 --
 -- CREATE TABLE ...
 
-
+CREATE TABLE order_details (
+   id SERIAL PRIMARY KEY,
+   order_id INT NOT NULL,
+   menu_item_id INT NOT NULL,
+   quantity INT NOT NULL CHECK (quantity > 0),
+   price_at_purchase DECIMAL(10, 2) NOT NULL CHECK (price_at_purchase > 0),
+   CONSTRAINT fk_detail_order FOREIGN KEY (order_id) REFERENCES orders(id) ON DELETE CASCADE,
+   CONSTRAINT fk_detail_menu FOREIGN KEY (menu_item_id) REFERENCES menu_items(id) ON DELETE RESTRICT
+);
 
 -- =======================================================
 -- INITIAL MENU DATA
@@ -116,7 +145,11 @@
 --
 -- INSERT INTO ...
 
-
+INSERT INTO menu_items (name, description, price, category) VALUES
+('Pizza', 'Delicious cheese and pepperoni pizza', 10.00, 'Pizza'),
+('Burger', 'Juicy grilled beef burger with fries', 8.00, 'Burger'),
+('Pasta', 'Creamy Alfredo pasta with chicken', 12.00, 'Pasta'),
+('Coca Cola', 'Chilled soft drink', 2.50, 'Drink');
 
 -- =======================================================
 -- OPTIONAL TEST DATA
@@ -127,7 +160,14 @@
 --
 -- INSERT INTO ...
 
+INSERT INTO users (username, password, email) VALUES
+('fatemeh_demo', '$2a$10$EixZaYVK1upmZ7zpKgH97O5F', 'fatemeh@example.com');
 
+INSERT INTO orders (user_id, total_amount) VALUES
+(1, 20.00);
+
+INSERT INTO order_details (order_id, menu_item_id, quantity, price_at_purchase) VALUES
+(1, 1, 2, 10.00);
 
 -- =======================================================
 -- VERIFICATION QUERIES
@@ -135,7 +175,7 @@
 --
 -- Uncomment these queries to verify your database.
 --
--- SELECT * FROM ...;
--- SELECT * FROM ...;
--- SELECT * FROM ...;
--- SELECT * FROM ...;
+SELECT * FROM users;
+SELECT * FROM menu_items;
+SELECT * FROM orders;
+SELECT * FROM orders;