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Intermediate SQL
course content

Course Content

Intermediate SQL

Intermediate SQL

1. Grouping
GROUP BYOrder of StatementsTotal Ride Time for Each Subway Line ChallengeAverage Student's Grade ChallengeSearching for the Top Math Students ChallengeHAVINGSeveral Aggregate Functions in the QueryMore Complex Filtering
2. Nested Subqueries
Nested QueriesNon-tech Department Employees ChallengeUsing Inner Subqueries in the FROM SectionEmployees With More Than Average Salary ChallengeUNION ClauseCombining Table Results
3. Joining Tables
JOIN 2 TablesGet Category By Product PriceGet Minimum Price By CategoryGet Product Amount By CategoryLEFT, RIGHT and INNER JOINsTable Join PracticeFULL JOIN Usage
4. DDL and DML in SQL
CREATE and ConstraintsALTER and INSERT OperationsDROP and TRUNCATEUPDATE and DELETE

bookSearching 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
copy

As you can see, there are only 3 such employees, and we used the necessary tools to achieve this result. Your task will be very similar, I'm sure you can handle it!

Here is the preview of a student_grades table we are working with:

Task
test

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.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 1. Chapter 5
toggle bottom row

bookSearching 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
copy

As you can see, there are only 3 such employees, and we used the necessary tools to achieve this result. Your task will be very similar, I'm sure you can handle it!

Here is the preview of a student_grades table we are working with:

Task
test

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.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 1. Chapter 5
toggle bottom row

bookSearching 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
copy

As you can see, there are only 3 such employees, and we used the necessary tools to achieve this result. Your task will be very similar, I'm sure you can handle it!

Here is the preview of a student_grades table we are working with:

Task
test

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.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

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
copy

As you can see, there are only 3 such employees, and we used the necessary tools to achieve this result. Your task will be very similar, I'm sure you can handle it!

Here is the preview of a student_grades table we are working with:

Task
test

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.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Section 1. Chapter 5
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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