database

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
@@ -28,9 +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(250) NOT NULL,
+    email VARCHAR(100)
+);
 
 -- =======================================================
 -- MENU ITEM TABLE
@@ -50,9 +56,12 @@
 -- - Name is required.
 -- - Price must always be positive.
 --
--- CREATE TABLE ...
-
-
+CREATE TABLE menu_items (
+  id SERIAL PRIMARY KEY,
+  name VARCHAR(100),
+  price DECIMAL(10,2) NOT NULL CHECK (price > 0),
+  category VARCHAR(50)
+);
 
 -- =======================================================
 -- ORDER TABLE
@@ -75,9 +84,15 @@
 -- 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 INTEGER NOT NULL,
+    orderDate TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+    total_price DECIMAL(10,2) NOT NULL,
 
+    CONSTRAINT fk_orders
+        FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+);
 
 -- =======================================================
 -- ORDER DETAIL TABLE
@@ -98,7 +113,21 @@
 -- - 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 INTEGER NOT NULL,
+    menu_items_id INTEGER NOT NULL,
+    quantity INTEGER NOT NULL CHECK (quantity>0),
+    price_at_purchase DECIMAL(10,2) NOT NULL,
+
+    CONSTRAINT fk_order_detail_order
+        FOREIGN KEY (order_id) REFERENCES orders(id)
+        ON DELETE CASCADE,
+
+    CONSTRAINT fk_menu_items_id
+        FOREIGN KEY (menu_items_id) REFERENCES menu_items(id)
+        ON DELETE RESTRICT
+);
 
 
 
@@ -114,7 +143,11 @@
 -- - Pasta
 -- - Drink
 --
--- INSERT INTO ...
+INSERT INTO menu_items (name, price, category) VALUES
+    ('Margherita', 9.99, 'Pizza'),
+    ('Cheeseburger', 8.50, 'Burger'),
+    ('Alfredo pasta', 12.00, 'Pasta'),
+    ('Coca Cola', 2.50, 'Drink');
 
 
 
@@ -125,9 +158,16 @@
 -- You may insert sample users and orders for testing.
 -- This section is optional.
 --
--- INSERT INTO ...
+INSERT INTO users (username, password, email) VALUES
+    ('aga armin', MD5('123456'), 'ar@example.com'),
+    ('mewsoume', MD5('mypass'), 'm@example.com');
 
+INSERT INTO orders (user_id, total_price) VALUES
+    (1, 22.49);
 
+INSERT INTO order_details (order_id, menu_items_id, quantity, price_at_purchase) VALUES
+    (1, 1, 2, 9.99),
+    (1, 3, 1, 12.00);
 
 -- =======================================================
 -- VERIFICATION QUERIES