Searching for the Top Math Students Challenge

The school is pleased with our work and agrees to continue the collaboration.

Now they have a new task for us. The top 10 students with the highest average grades will be offered a trip to a scientific center as a reward. One mandatory condition is receiving a grade above 90 on the math exam. To find such students, they have turned to you.

Let's see what we need to do using our employee table as an example.

Suppose we need to find out in which departments there are employees who were hired before 2019 and the average salary in those departments. To implement such a task, we can use the following query:


              1234
            
SELECT department, AVG(salary) AS average_salary
FROM employees
WHERE hire_date < '2019-01-01'
GROUP BY department

As you can see, there are only 3 such employees, and we used the necessary tools to achieve this result.

Task

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Your task is to retrieve up to 10 students with the highest average grade among all students who scored above or equal to 90 on the math exam.

Also, sort the result by the average_grade column in the descending order.

Give an alias average_grade to the average grade to ensure the task is successfully checked for correctness.

Brief Instructions

Retrieve the student_surname column and the average of the grade column using the AVG() function.
Assign the alias average_grade to the second column.
Apply a condition where grade >= 90 and subject_name = 'Mathematics'.
Group the results by student_surname.
Sort the results by average_grade in descending order.
Use the LIMIT clause to return only 10 results.

Solution

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Everything was clear?

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Section 1. Chapter 5

Searching for the Top Math Students Challenge

The school is pleased with our work and agrees to continue the collaboration.

Let's see what we need to do using our employee table as an example.


              1234
            
SELECT department, AVG(salary) AS average_salary
FROM employees
WHERE hire_date < '2019-01-01'
GROUP BY department

As you can see, there are only 3 such employees, and we used the necessary tools to achieve this result.

Task

Swipe to show code editor

Your task is to retrieve up to 10 students with the highest average grade among all students who scored above or equal to 90 on the math exam.

Also, sort the result by the average_grade column in the descending order.

Give an alias average_grade to the average grade to ensure the task is successfully checked for correctness.

Brief Instructions

Retrieve the student_surname column and the average of the grade column using the AVG() function.
Assign the alias average_grade to the second column.
Apply a condition where grade >= 90 and subject_name = 'Mathematics'.
Group the results by student_surname.
Sort the results by average_grade in descending order.
Use the LIMIT clause to return only 10 results.

Solution

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 1. Chapter 5

Switch to desktop for real-world practiceContinue from where you are using one of the options below