KOLA ADEROJU ABDULMALIK

.vscode/settings.json

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+{
+    "python.testing.unittestArgs": [
+        "-v",
+        "-s",
+        ".",
+        "-p",
+        "*test.py"
+    ],
+    "python.testing.pytestEnabled": false,
+    "python.testing.unittestEnabled": true
+}

Sales_report.py

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+# Python Tasks Implementation
+
+# 1. Create lists/dictionaries to simulate new order data
+new_orders = [
+    {
+        'customer': {'id': 6, 'name': 'Bola Adekunle', 'email': 'bola@example.com'},
+        'order_date': '2025-06-05',
+        'items': [
+            {'product_id': 1, 'name': 'Phone', 'price': '2.99', 'quantity': 3},
+            {'product_id': 5, 'name': 'Chicken', 'price': '5.99', 'quantity': 2}
+        ]
+    },
+    {
+        'customer': {'id': 7, 'name': 'Yemi Alade', 'email': 'yemi@example.com'},
+        'order_date': '2025-06-06',
+        'items': [
+            {'product_id': 3, 'name': 'Eggs', 'price': '3.49', 'quantity': 5}
+        ]
+    }
+]
+
+# 2. Use if, and, or to identify customers who placed large orders
+print("Customers with large orders:")
+for order in new_orders:
+    total = sum(float(item['price']) * item['quantity'] for item in order['items'])
+    if total > 15 or (order['customer']['name'].startswith('B') and total > 10):
+        print(f"{order['customer']['name']} placed a large order worth ${total:.2f}")
+
+# 3. Convert product prices from string to float and apply discounts
+print("\nApplying 10% discount to all products:")
+for order in new_orders:
+    for item in order['items']:
+        original_price = float(item['price'])
+        discounted_price = original_price * 0.9  # 10% discount
+        item['price'] = str(discounted_price)
+        print(f"{item['name']}: ${original_price:.2f} → ${discounted_price:.2f}")
+
+# 4. Create a dictionary report summarizing sales
+def generate_sales_report(orders):
+    report = {
+        'total_products_sold': 0,
+        'products': {},
+        'customers': {},
+        'most_popular_product': {'name': '', 'quantity': 0},
+        'total_revenue': 0.0
+    }
+
+    for order in orders:
+        customer_name = order['customer']['name']
+        if customer_name not in report['customers']:
+            report['customers'][customer_name] = {'total_spent': 0.0, 'items': 0}
+
+        for item in order['items']:
+            # Update product stats
+            product_name = item['name']
+            quantity = item['quantity']
+            price = float(item['price'])
+
+            if product_name not in report['products']:
+                report['products'][product_name] = 0
+            report['products'][product_name] += quantity
+
+            # Update customer stats
+            report['customers'][customer_name]['total_spent'] += price * quantity
+            report['customers'][customer_name]['items'] += quantity
+
+            # Update totals
+            report['total_products_sold'] += quantity
+            report['total_revenue'] += price * quantity
+
+            # Check for most popular product
+            if report['products'][product_name] > report['most_popular_product']['quantity']:
+                report['most_popular_product'] = {'name': product_name, 'quantity': report['products'][product_name]}
+
+    return report
+
+# Generate and display the report
+sales_report = generate_sales_report(new_orders)
+print("\nSales Report:")
+print(f"Total products sold: {sales_report['total_products_sold']}")
+print(f"Most popular product: {sales_report['most_popular_product']['name']} ({sales_report['most_popular_product']['quantity']} units)")
+print(f"Total revenue: ${sales_report['total_revenue']:.2f}")
+
+print("\nRevenue by customer:")
+for customer, data in sales_report['customers'].items():
+    print(f"{customer}: ${data['total_spent']:.2f} (for {data['items']} items)")
+
+print("\nProducts sold:")
+for product, quantity in sales_report['products'].items():
+    print(f"{product}: {quantity} units")

Student_data.py

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+# Initialize a global list to store all students
+students = []
+
+def add_student():
+    """
+    Adds students to the database until user enters 'stop'
+    """
+    print("\nAdd Student Mode (enter 'stop' as name to finish)")
+
+    while True:
+        print("\nPlease enter student information:")
+        name = input("Name: ")
+
+        if name.lower() == 'stop':
+            print("\nStudent registration completed!")
+            break
+
+        age = input("Age: ")
+
+        # Validate grade input
+        while True:
+            grade = input("Grade (0-100): ")
+            try:
+                grade = float(grade)
+                if 0 <= grade <= 100:
+                    break
+                else:
+                    print("Grade must be between 0 and 100!")
+            except ValueError:
+                print("Please enter a valid number for grade!")
+
+        # Add student to global list
+        students.append({
+            "name": name,
+            "age": age,
+            "grade": grade
+        })
+
+        print(f"\nStudent {name} added successfully!")
+        print(f"Total students: {len(students)}")
+
+def view_students():
+    """
+    Displays all students in the database
+    """
+    if not students:
+        print("\nNo students in the database!")
+        return
+
+    print("\nSTUDENT DATABASE")
+    print("=" * 40)
+    for i, student in enumerate(students, 1):
+        print(f"\nStudent #{i}")
+        print(f"Name: {student['name']}")
+        print(f"Age: {student['age']}")
+        print(f"Grade: {student['grade']}")
+    print("\n" + "=" * 40)
+    print(f"Total students: {len(students)}")
+
+def get_average_grade():
+    """
+    Calculates and returns the average grade
+    """
+    if not students:
+        return 0.0
+
+    total = sum(student['grade'] for student in students)
+    return total / len(students)
+
+def main_menu():
+    """
+    Main program interface
+    """
+    while True:
+        print("\n" + "=" * 30)
+        print("STUDENT MANAGEMENT SYSTEM")
+        print("=" * 30)
+        print("\n1. Add Students")
+        print("2. View All Students")
+        print("3. View Average Grade")
+        print("4. Exit")
+
+        choice = input("\nEnter your choice (1-4): ")
+
+        if choice == '1':
+            add_student()
+        elif choice == '2':
+            view_students()
+        elif choice == '3':
+            avg = get_average_grade()
+            print(f"\nAverage Grade: {avg:.2f}")
+        elif choice == '4':
+            print("\nThank you for using the system. Goodbye!")
+            break
+        else:
+            print("\nInvalid choice! Please enter 1-4")
+
+if __name__ == "__main__":
+    main_menu()

_Task 5-- Total orders_.csv

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+"total_orders"
+5

_Task_4_Retrieving_all_orders_made_by_a_specific_customer_SELECT_202506141126.csv

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+"order_id","order_date"
+1,"2025-06-01"
+3,"2025-06-03"

_Task_6_Calculate_the_total_revenue_from_all_orders_SELECT_SUM_p_202506141130.csv

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+"total_revenue"
+44.830000000000005

_Task_7_Using_INNER_JOIN_to_show_order_details_including_custome_202506141131.csv

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+"customer_name","order_date","product_name","quantity","price","item_total"
+Kola Aderoju,"2025-06-01",Phone,2,2.99,5.98
+Kola Aderoju,"2025-06-01",Cars,1,1.99,1.99
+Ishola Rokibat,"2025-06-02",Eggs,1,3.49,3.49
+Ishola Rokibat,"2025-06-02",Corn,5,0.99,4.95
+Kola Aderoju,"2025-06-03",Chicken,2,5.99,11.98
+Oladele Joseph,"2025-06-03",Phone,3,2.99,8.97
+Omotosho Mubarak,"2025-06-04",Cars,2,1.99,3.98
+Omotosho Mubarak,"2025-06-04",Eggs,1,3.49,3.49

_Task_8_Using_LEFT_JOIN_to_show_all_products_and_any_related_ord_202506141131.csv

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+"product_name","price","total_quantity_sold","total_revenue"
+Cars,1.99,3,5.97
+Chicken,5.99,2,11.98
+Corn,0.99,5,4.95
+Eggs,3.49,2,6.98
+Phone,2.99,5,14.950000000000001

second_examination.sql

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+-- Task 1: Creating the tables
+CREATE TABLE customers (
+    customer_id SERIAL PRIMARY KEY,
+    name TEXT NOT NULL,
+    email TEXT,
+    join_date DATE NOT NULL
+);
+
+CREATE TABLE products (
+    product_id INT PRIMARY KEY,
+    name TEXT NOT NULL,
+    price REAL NOT NULL,
+    category TEXT
+);
+
+CREATE TABLE orders (
+    order_id INT PRIMARY KEY,
+    customer_id INT NOT NULL,
+    order_date DATE NOT NULL,
+    FOREIGN KEY (customer_id) REFERENCES customers(customer_id)
+);
+
+CREATE TABLE order_items (
+    item_id INT PRIMARY KEY,
+    order_id INT,
+    product_id INT,
+    quantity INT,
+    FOREIGN KEY (order_id) REFERENCES orders(order_id),
+    FOREIGN KEY (product_id) REFERENCES products(product_id)
+);
+
+-- Task 2: Altering one of the tables to add a new column
+ALTER TABLE products ADD COLUMN stock INTEGER DEFAULT 0;
+
+-- Task 3: Inserting at 5 rows into each table
+
+-- Insert customers
+INSERT INTO customers VALUES 
+(1, 'Kola Aderoju', 'kolaaderoju@example.com', '2025-01-15'),
+(2, 'Ishola Rokibat', 'isholarokibat@example.com', '2025-02-20'),
+(3, 'Oladele Joseph', 'josephola@example.com', '2025-03-10'),
+(4, 'Omotosho Mubarak', 'omotoshomubarak@example.com', '2025-04-05'),
+(5, 'Abiade Zainab', 'abiadezainab@example.com', '2025-05-12');
+
+-- Insert products
+INSERT INTO products VALUES 
+(1, 'Phone', 2.99, 'Telecommunications', 50),
+(2, 'Cars', 1.99, 'Automobiles', 100),
+(3, 'Eggs', 3.49, 'Dairy', 75),
+(4, 'Corn', 0.99, 'Cereals', 200),
+(5, 'Chicken', 5.99, 'Meat', 30);
+
+-- Insert orders
+INSERT INTO orders VALUES 
+(1, 1, '2025-06-01'),
+(2, 2, '2025-06-02'),
+(3, 1, '2025-06-03'),
+(4, 3, '2025-06-03'),
+(5, 4, '2025-06-04');
+
+-- Insert order items
+INSERT INTO order_items VALUES 
+(1, 1, 1, 2),
+(2, 1, 2, 1),
+(3, 2, 3, 1),
+(4, 2, 4, 5),
+(5, 3, 5, 2),
+(6, 4, 1, 3),
+(7, 5, 2, 2),
+(8, 5, 3, 1);
+
+-- Task 4: Retrieving all orders made by a specific customer
+SELECT o.order_id, o.order_date 
+FROM orders o
+JOIN customers c ON o.customer_id = c.customer_id
+WHERE c.name = 'Kola Aderoju';
+
+-- Task 5: Get the total number of orders
+SELECT COUNT(*) AS total_orders FROM orders;
+
+-- Task 6: Calculate the total revenue from all orders
+SELECT SUM(p.price * oi.quantity) AS total_revenue
+FROM order_items oi
+JOIN products p ON oi.product_id = p.product_id;
+
+-- Task 7: Using INNER JOIN to show order details including customer and product names
+SELECT c.name AS customer_name, 
+       o.order_date, 
+       p.name AS product_name, 
+       oi.quantity, 
+       p.price,
+       (p.price * oi.quantity) AS item_total
+FROM order_items oi
+JOIN orders o ON oi.order_id = o.order_id
+JOIN customers c ON o.customer_id = c.customer_id
+JOIN products p ON oi.product_id = p.product_id;
+
+-- Task 8: Using LEFT JOIN to show all products and any related order (even if not sold)
+SELECT p.name AS product_name, 
+       p.price, 
+       COALESCE(SUM(oi.quantity), 0) AS total_quantity_sold,
+       COALESCE(SUM(p.price * oi.quantity), 0) AS total_revenue
+FROM products p
+LEFT JOIN order_items oi ON p.product_id = oi.product_id
+GROUP BY p.name, p.price;
+