Implement Todos for database and management service

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
@@ -28,8 +31,12 @@
 -- - Username and password are required.
 -- - Passwords should not be stored in plain text.
 --
--- CREATE TABLE ...
-
+CREATE TABLE users (
+    id SERIAL PRIMARY KEY,
+    username VARCHAR(50) UNIQUE NOT NULL,
+    password VARCHAR(255) NOT NULL,
+    email VARCHAR(100)
+);
 
 
 -- =======================================================
@@ -50,8 +57,13 @@
 -- - Name is required.
 -- - Price must always be positive.
 --
--- CREATE TABLE ...
-
+CREATE TABLE menu_items (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(100) NOT NULL,
+    description TEXT,
+    price NUMERIC(10, 2) NOT NULL CHECK (price > 0),
+    category VARCHAR(50)
+);
 
 
 -- =======================================================
@@ -75,8 +87,12 @@
 -- Avoid using reserved SQL keywords as table names.
 -- Consider using a name such as "orders" or "customer_orders".
 --
--- CREATE TABLE ...
-
+CREATE TABLE orders (
+    id SERIAL PRIMARY KEY,
+    user_id INT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    created_at TIMESTAMP NOT NULL,
+    total_price NUMERIC(10, 2) NOT NULL DEFAULT 0.00
+);
 
 
 -- =======================================================
@@ -98,8 +114,13 @@
 -- - Quantity must always be greater than zero.
 -- - Store the item's price at the moment of purchase.
 --
--- CREATE TABLE ...
-
+CREATE TABLE order_details (
+    id SERIAL PRIMARY KEY,
+    order_id INT NOT NULL REFERENCES orders(id) ON DELETE CASCADE,
+    menu_item_id INT NOT NULL REFERENCES menu_items(id),
+    quantity INT NOT NULL CHECK (quantity > 0),
+    price NUMERIC(10, 2) NOT NULL
+);
 
 
 -- =======================================================
@@ -114,8 +135,11 @@
 -- - Pasta
 -- - Drink
 --
--- INSERT INTO ...
-
+INSERT INTO menu_items (name, description, price, category) VALUES
+('Pizza', 'Delicious cheese pizza with tomato sauce', 10.00, 'Pizza'),
+('Burger', 'Juicy beef burger with lettuce and tomato', 8.00, 'Burger'),
+('Pasta', 'Rich creamy Alfredo pasta', 12.00, 'Pasta'),
+('Soda', 'Cold carbonated drink', 2.50, 'Drink');
 
 
 -- =======================================================
@@ -125,8 +149,6 @@
 -- You may insert sample users and orders for testing.
 -- This section is optional.
 --
--- INSERT INTO ...
-
 
 
 -- =======================================================
@@ -135,7 +157,7 @@
 --
 -- 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 order_details;