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Intermediate SQL
course content

Course Content

Intermediate SQL

Intermediate SQL

1. Grouping
GROUP BY ClauseOrder of StatementsChallenge: Total Ride Time for Each Subway LineAverage Student's Grade ChallengeSearching for the Top Math Students ChallengeHAVING ClauseSeveral Aggregate Functions in the QueryMore Complex Filtering
2. Nested Subqueries
Nested QueriesChallenge: Non-tech Department EmployeesUsing Inner Subqueries in the FROM SectionChallenge: Employees With More Than Average SalaryUNION ClauseChallenge: Combining Table Results
3. Joining Tables
JOIN 2 TablesChallenge: Get Category By Product PriceChallenge: Get Minimum Price By CategoryChallenge: Get Product Amount By CategoryLEFT, RIGHT and INNER JOINsChallenge: Table JoinChallenge: FULL JOIN Usage
4. DDL and DML in SQL
CREATE and ConstraintsALTER and INSERT OperationsDROP and TRUNCATEUPDATE and DELETE

book
More Complex Filtering

The school recently held a competition for students who participated in Mathematics. Some students were rewarded, but now the school wants to ensure no students cheated by taking more than one exam, including the math exam.

Your task is to find the last names of students who took more than one exam, with one of them being Mathematics.

Here is the query from our previous assignment that you can use as an example:


              
1234

            
SELECT student_surname, AVG(grade) as average_grade
FROM student_grades
GROUP BY student_surname
HAVING COUNT(grade) > 1
copy
Task

Swipe to start coding

Retrieve the last names of those students who received more than one grade and one of the subjects they took was Mathematics.

Note

Retrieve only the surname of these students. The answer should have only one column.

Brief Instructions

  • Retrieve the student_surname column.
  • Use the WHERE clause to set subject_name = 'Mathematics'.
  • Group the results by student_surname.
  • Use the HAVING clause with COUNT(grade) > 1.

Solution

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SectionΒ 1. ChapterΒ 8
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book
More Complex Filtering

The school recently held a competition for students who participated in Mathematics. Some students were rewarded, but now the school wants to ensure no students cheated by taking more than one exam, including the math exam.

Your task is to find the last names of students who took more than one exam, with one of them being Mathematics.

Here is the query from our previous assignment that you can use as an example:


              
1234

            
SELECT student_surname, AVG(grade) as average_grade
FROM student_grades
GROUP BY student_surname
HAVING COUNT(grade) > 1
copy
Task

Swipe to start coding

Retrieve the last names of those students who received more than one grade and one of the subjects they took was Mathematics.

Note

Retrieve only the surname of these students. The answer should have only one column.

Brief Instructions

  • Retrieve the student_surname column.
  • Use the WHERE clause to set subject_name = 'Mathematics'.
  • Group the results by student_surname.
  • Use the HAVING clause with COUNT(grade) > 1.

Solution

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!

SectionΒ 1. ChapterΒ 8
Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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