database.sql completed.

.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml
+# Ignored default folder with query files
+/queries/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/

.idea/compiler.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <annotationProcessing>
+      <profile name="Maven default annotation processors profile" enabled="true">
+        <sourceOutputDir name="target/generated-sources/annotations" />
+        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
+        <outputRelativeToContentRoot value="true" />
+        <module name="WS-10-Database" />
+      </profile>
+    </annotationProcessing>
+  </component>
+</project>

.idea/dataSources.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DataSourceManagerImpl" format="xml" multifile-model="true">
+    <data-source source="LOCAL" name="postgres@localhost" uuid="7eaa055b-aec6-4a3e-a6f8-6ca90a4ee622">
+      <driver-ref>postgresql</driver-ref>
+      <synchronize>true</synchronize>
+      <jdbc-driver>org.postgresql.Driver</jdbc-driver>
+      <jdbc-url>jdbc:postgresql://localhost:5432/postgres</jdbc-url>
+      <working-dir>$ProjectFileDir$</working-dir>
+    </data-source>
+  </component>
+</project>

.idea/encodings.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+  </component>
+</project>

.idea/jarRepositories.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Central Repository" />
+      <option name="url" value="https://maven.myket.ir" />
+    </remote-repository>
+  </component>
+</project>

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_25" default="true" project-jdk-name="25" project-jdk-type="JavaSDK" />
+</project>

.idea/sqldialects.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="SqlDialectMappings">
+    <file url="file://$PROJECT_DIR$/database.sql" dialect="GenericSQL" />
+  </component>
+</project>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

database.sql

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--- Restaurant Database Management System
---
--- Instructions:
--- 1. Create all required tables.
--- 2. Design appropriate PRIMARY KEY and FOREIGN KEY relationships.
--- 3. Add suitable constraints based on the requirements.
--- 4. Insert initial mock data.
--- 5. Insert at least 3 menu items.
--- 6. The script should be executable from start to finish without errors.
-
-
-
--- =======================================================
 -- USER TABLE
--- =======================================================
+CREATE TABLE users (
---
+    id SERIAL PRIMARY KEY,
--- Represents customers using the system.
+    username VARCHAR(50) UNIQUE NOT NULL,
---
+    password VARCHAR(255) NOT NULL,
--- Required information:
+    email VARCHAR(100)
--- - Unique identifier
+);
--- - Username
--- - Password
--- - Email (optional)
---
--- Requirements:
--- - Each user must have a unique identifier.
--- - Usernames must be unique.
--- - Username and password are required.
--- - Passwords should not be stored in plain text.
---
--- CREATE TABLE ...
 
-
-
--- =======================================================
 -- MENU ITEM TABLE
--- =======================================================
+CREATE TABLE menu_items (
---
+    id SERIAL PRIMARY KEY,
--- Represents available food and drink items.
+    name VARCHAR(100) NOT NULL,
---
+    description TEXT,
--- Required information:
+    price DECIMAL(10,2) NOT NULL CHECK (price > 0),
--- - Unique identifier
+    category VARCHAR(50)
--- - Name
+);
--- - Description (optional)
--- - Price
--- - Category (optional)
---
--- Requirements:
--- - Each menu item must have a unique identifier.
--- - Name is required.
--- - Price must always be positive.
---
--- CREATE TABLE ...
 
-
-
--- =======================================================
 -- ORDER TABLE
--- =======================================================
+CREATE TABLE orders (
---
+    id SERIAL PRIMARY KEY,
--- Represents orders placed by customers.
+    user_id INT NOT NULL,
---
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
--- Required information:
+    total_price DECIMAL(10, 2) NOT NULL DEFAULT 0.00,
--- - Unique identifier
+    CONSTRAINT fk_user_order FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
--- - Reference to customer
+);
--- - Creation date and time
--- - Total price
---
--- Requirements:
--- - Each order must belong to exactly one user.
--- - A user can have multiple orders.
--- - The relationship between User and Order must be implemented.
---
--- Note:
--- Avoid using reserved SQL keywords as table names.
--- Consider using a name such as "orders" or "customer_orders".
---
--- CREATE TABLE ...
 
-
-
--- =======================================================
 -- ORDER DETAIL TABLE
--- =======================================================
+CREATE TABLE order_details (
---
+    id SERIAL PRIMARY KEY,
--- Represents items inside an order.
+    order_id INT NOT NULL,
---
+    menu_item_id INT NOT NULL,
--- Required information:
+    quantity INT NOT NULL CHECK (quantity>0),
--- - Unique identifier
+    price_at_purchase DECIMAL(10,2) NOT NULL,
--- - Reference to an order
+    CONSTRAINT fk_detail_order FOREIGN KEY (order_id) REFERENCES orders(id) ON DELETE CASCADE,
--- - Reference to a menu item
+    CONSTRAINT fk_detail_menu FOREIGN KEY (menu_item_id) REFERENCES menu_items(id)
--- - Quantity
+)
--- - Item price at purchase time
---
--- Requirements:
--- - Each detail record must belong to one order.
--- - Each detail record must reference one menu item.
--- - Quantity must always be greater than zero.
--- - Store the item's price at the moment of purchase.
---
--- CREATE TABLE ...
 
 
-
--- =======================================================
 -- INITIAL MENU DATA
--- =======================================================
+INSERT INTO menu_items (name, description, price, category) VALUES
---
+('Cheeseburger', 'Juicy beef patty with cheddar cheese', 8.99, 'Food'),
--- Insert at least 3 food or drink items.
+('Pepperoni Pizza', 'Classic pizza with pepperoni and mozzarella', 12.50, 'Food'),
---
+('Iced Latte', 'Espresso with cold milk and ice', 4.25, 'Drink');
--- Example categories:
--- - Pizza
--- - Burger
--- - Pasta
--- - Drink
---
--- INSERT INTO ...
 
 
-
--- =======================================================
 -- OPTIONAL TEST DATA
--- =======================================================
+INSERT INTO users (username, password, email) VALUES
---
+('mardin_dev', 'hashed_pass_123', 'mardin@example.com'),
--- You may insert sample users and orders for testing.
+('sara_kh', 'hashed_pass_456', 'sara@example.com');
--- This section is optional.
+
---
+INSERT INTO orders (user_id, total_price) VALUES
--- INSERT INTO ...
+(1, 21.49),
+(2, 4.25);
+
+INSERT INTO order_details (order_id, menu_item_id, quantity, price_at_purchase) VALUES
+(1, 1, 1, 8.99),
+(1, 2, 1, 12.50);
+
+INSERT INTO order_details (order_id, menu_item_id, quantity, price_at_purchase) VALUES
+(2, 3, 1, 4.25);
 
 
-
--- =======================================================
 -- VERIFICATION QUERIES
--- =======================================================
+SELECT * FROM users;
---
+SELECT * FROM menu_items;
--- Uncomment these queries to verify your database.
+SELECT * FROM orders;
---
+SELECT * FROM order_details;
--- SELECT * FROM ...;
+
--- SELECT * FROM ...;
+SELECT
--- SELECT * FROM ...;
+    o.id AS order_number,
--- SELECT * FROM ...;
+    u.username AS customer,
+    m.name AS food_item,
+    od.quantity,
+    od.price_at_purchase,
+    (od.quantity * od.price_at_purchase) AS subtotal,
+    o.created_at
+FROM orders o
+         JOIN users u ON o.user_id = u.id
+         JOIN order_details od ON od.order_id = o.id
+         JOIN menu_items m ON od.menu_item_id = m.id;