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Post Info TOPIC: Mastering SQL: Sample Assignments and Solutions for Students


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Mastering SQL: Sample Assignments and Solutions for Students
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Are you struggling with your SQL assignments? Worry no more! At ProgrammingHomeworkHelp.com, we understand the complexities students face when dealing with SQL queries and database management tasks. Whether you're a beginner or an advanced learner, our expert team is here to assist you in mastering SQL concepts and acing your assignments. In this post, we'll delve into two master-level SQL questions along with detailed solutions, crafted by our seasoned professionals. So, if you're looking for top-notch guidance to excel in your SQL assignments, you're in the right place! If you're thinking, 'Who can do my SQL assignment?' - rest assured, our dedicated team is ready to assist you every step of the way!

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Question 1: Analyzing Sales Data

You've been tasked with analyzing sales data from a database containing two tables: "Orders" and "Customers." The "Orders" table includes the following columns: order_id, customer_id, order_date, and total_amount. The "Customers" table includes: customer_id, customer_name, and country. Your goal is to retrieve the total sales amount for each country for the year 2023. Write an SQL query to accomplish this task.

Solution 1:

```sql
SELECT c.country, SUM(o.total_amount) AS total_sales_amount
FROM Orders o
JOIN Customers c ON o.customer_id = c.customer_id
WHERE YEAR(o.order_date) = 2023
GROUP BY c.country;
```

Explanation:

In this query, we first join the "Orders" table with the "Customers" table using the common column customer_id. We then filter the orders for the year 2023 using the YEAR() function on the order_date column. Next, we group the results by country and calculate the total sales amount using the SUM() function on the total_amount column. The result gives us the total sales amount for each country in the year 2023.

Question 2: Employee Performance Evaluation

You're responsible for evaluating the performance of employees based on their sales contributions. The database contains three tables: "Employees," "Orders," and "Order_Items." The "Employees" table includes: employee_id, employee_name, and department_id. The "Orders" table contains: order_id, employee_id, and order_date. The "Order_Items" table includes: order_id, product_id, quantity, and unit_price. Write an SQL query to retrieve the top-performing employees along with their total sales amount for the month of April 2024.

Solution 2:

```sql
SELECT e.employee_id, e.employee_name, SUM(oi.quantity * oi.unit_price) AS total_sales_amount
FROM Employees e
JOIN Orders o ON e.employee_id = o.employee_id
JOIN Order_Items oi ON o.order_id = oi.order_id
WHERE MONTH(o.order_date) = 4 AND YEAR(o.order_date) = 2024
GROUP BY e.employee_id, e.employee_name
ORDER BY total_sales_amount DESC
LIMIT 5;
```

Explanation:

In this query, we join the "Employees" table with the "Orders" table and then with the "Order_Items" table to retrieve the sales data. We filter the orders for the month of April 2024 using the MONTH() and YEAR() functions on the order_date column. Then, we group the results by employee_id and employee_name, calculate the total sales amount by multiplying quantity with unit_price, and summing them up. Finally, we order the results by total_sales_amount in descending order and limit the output to the top 5 performing employees.

Conclusion

 

Mastering SQL requires practice and understanding of various concepts and techniques. With the right guidance and assistance, you can conquer even the most challenging assignments. At ProgrammingHomeworkHelp.com, we're dedicated to providing comprehensive support to students, ensuring they excel in their SQL coursework. We hope these sample questions and solutions have provided valuable insights into tackling complex SQL tasks. Remember, practice makes perfect, and our expert team is here to help you every step of the way. Don't hesitate to reach out to us for all your SQL assignment needs!



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