Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What does an INNER JOIN do?
💡 Hint: Think about how it filters records.
Question 2
Easy
Explain what a LEFT JOIN does.
💡 Hint: Remember, unmatched records from the right will show NULLs.
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Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What type of join returns records with matching values in both tables?
- INNER JOIN
- LEFT JOIN
- RIGHT JOIN
💡 Hint: Focus on matching values.
Question 2
True or False: A LEFT JOIN will always return rows even if there are no matches in the right table.
- True
- False
💡 Hint: Consider what happens to unmatched records.
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Challenge Problems
Push your limits with challenges.
Question 1
Given two tables: 'students' (id, name) and 'enrollments' (student_id, course_id), write a query using LEFT JOIN to select all students and their enrolled courses. Include students not enrolled in any course.
💡 Hint: Remember to include all students, regardless of their enrollment status.
Question 2
Using RIGHT JOIN, write a query to find all courses and the students enrolled in them, including courses with no students enrolled.
💡 Hint: Focus on ensuring all courses are listed.
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