Could you provide two SQL questions and one Python question?

In order to provide you with a comprehensive answer, I would need specific details for each of the SQL and Python questions you are asking about. However, I can certainly give you an example structure of how these questions can be resolved with hypothetical scenarios.

SQL Question 1: Employee Database

Problem:
Suppose you have a database containing information about employees. The table employees has columns: EmployeeID, FirstName, LastName, Department, Salary. You need to find the average salary for each department.

Solution:

SELECT Department, AVG(Salary) AS AverageSalary
FROM employees
GROUP BY Department;

Explanation:

• We use the AVG() function to compute the average salary for each department.
• The GROUP BY clause groups the rows based on unique values in the Department column.

SQL Question 2: Sales Database

Problem:
Imagine you have a sales table with columns: SaleID, ProductID, CustomerID, Date, Amount. You need to find the total sales amount for each product but only for sales in the year 2023.

Solution:

SELECT ProductID, SUM(Amount) AS TotalSales
FROM sales
WHERE YEAR(Date) = 2023
GROUP BY ProductID;

Explanation:

• The SUM() function calculates the total sales amount for each product.
• The WHERE clause filters rows to include only sales from the year 2023.
• The GROUP BY clause groups the results by ProductID.

Python Question: List Processing

Problem:
Given a list of numbers, write a Python function to return a new list with only the even numbers from the original list.

Solution:

def filter_even_numbers(input_list):
    return [num for num in input_list if num % 2 == 0]

# Example usage:
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
even_numbers = filter_even_numbers(numbers)
print(even_numbers)

Explanation:

• We define a function filter_even_numbers that takes input_list as an argument.
• A list comprehension is used to iterate through input_list, and we use the condition if num % 2 == 0 to check if a number is even.
• The function returns a new list containing only the even numbers.

If you provide specific questions or scenarios, I would be happy to offer more tailored solutions.