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Intermediate SQL
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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

bookAverage Student's Grade Challenge

You've done an excellent job and helped the construction company. They have started working on expanding the Yellow metro line.

They have recommended you, and the school has shown interest in you because they also have several tasks for you. But first, let's familiarize ourselves with the student_grades table they provide:

As you can see, the school has a total of 100 students, information about whom is provided in the given table. There is information in the class_letter column, which has 3 options: A, B, or C. The subject name(subject_name), as well as the student's grade(grade), are included. The table is simple and contains grades for exams in various subjects.

Let's see how many students there are in each class with the following query:


              
123

            
SELECT class_letter, COUNT(DISTINCT student_surname) AS anumber_of_students
FROM student_grades
GROUP BY class_letter
copy

However, the school has given us a task to calculate the average grade for all subjects for each student. This is what you need to do in this chapter.

Task

Your task now is to calculate the average grade for all subjects for each student. Also, for the convenience of the teachers, you need to sort the students' last names in alphabetical order. Use aggregation with the AVG() function and give an alias average_grade to ensure successful testing.

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Section 1. Chapter 4
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bookAverage Student's Grade Challenge

You've done an excellent job and helped the construction company. They have started working on expanding the Yellow metro line.

They have recommended you, and the school has shown interest in you because they also have several tasks for you. But first, let's familiarize ourselves with the student_grades table they provide:

As you can see, the school has a total of 100 students, information about whom is provided in the given table. There is information in the class_letter column, which has 3 options: A, B, or C. The subject name(subject_name), as well as the student's grade(grade), are included. The table is simple and contains grades for exams in various subjects.

Let's see how many students there are in each class with the following query:


              
123

            
SELECT class_letter, COUNT(DISTINCT student_surname) AS anumber_of_students
FROM student_grades
GROUP BY class_letter
copy

However, the school has given us a task to calculate the average grade for all subjects for each student. This is what you need to do in this chapter.

Task

Your task now is to calculate the average grade for all subjects for each student. Also, for the convenience of the teachers, you need to sort the students' last names in alphabetical order. Use aggregation with the AVG() function and give an alias average_grade to ensure successful testing.

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 4
toggle bottom row

bookAverage Student's Grade Challenge

You've done an excellent job and helped the construction company. They have started working on expanding the Yellow metro line.

They have recommended you, and the school has shown interest in you because they also have several tasks for you. But first, let's familiarize ourselves with the student_grades table they provide:

As you can see, the school has a total of 100 students, information about whom is provided in the given table. There is information in the class_letter column, which has 3 options: A, B, or C. The subject name(subject_name), as well as the student's grade(grade), are included. The table is simple and contains grades for exams in various subjects.

Let's see how many students there are in each class with the following query:


              
123

            
SELECT class_letter, COUNT(DISTINCT student_surname) AS anumber_of_students
FROM student_grades
GROUP BY class_letter
copy

However, the school has given us a task to calculate the average grade for all subjects for each student. This is what you need to do in this chapter.

Task

Your task now is to calculate the average grade for all subjects for each student. Also, for the convenience of the teachers, you need to sort the students' last names in alphabetical order. Use aggregation with the AVG() function and give an alias average_grade to ensure successful testing.

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!

You've done an excellent job and helped the construction company. They have started working on expanding the Yellow metro line.

They have recommended you, and the school has shown interest in you because they also have several tasks for you. But first, let's familiarize ourselves with the student_grades table they provide:

As you can see, the school has a total of 100 students, information about whom is provided in the given table. There is information in the class_letter column, which has 3 options: A, B, or C. The subject name(subject_name), as well as the student's grade(grade), are included. The table is simple and contains grades for exams in various subjects.

Let's see how many students there are in each class with the following query:


              
123

            
SELECT class_letter, COUNT(DISTINCT student_surname) AS anumber_of_students
FROM student_grades
GROUP BY class_letter
copy

However, the school has given us a task to calculate the average grade for all subjects for each student. This is what you need to do in this chapter.

Task

Your task now is to calculate the average grade for all subjects for each student. Also, for the convenience of the teachers, you need to sort the students' last names in alphabetical order. Use aggregation with the AVG() function and give an alias average_grade to ensure successful testing.

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Section 1. Chapter 4
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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