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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What does INNER JOIN do in SQL?
💡 Hint: Think about how it relates to two sets of data.
Question 2
Easy
Write a basic INNER JOIN query to retrieve names from two related tables.
💡 Hint: Follow the structure of SELECT, FROM, JOIN.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the purpose of INNER JOIN?
- To merge tables
- To retrieve records with matching values
- To sort data
💡 Hint: Focus on what INNER JOIN filters out.
Question 2
True or False: INNER JOIN will return records even if there are no matches in both tables.
- True
- False
💡 Hint: Recall how INNER JOIN functions.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Write an INNER JOIN query that retrieves names and addresses of customers who have more than 3 orders.
💡 Hint: You need to group and filter based on the order count.
Question 2
Discuss how you would optimize an INNER JOIN query for large datasets.
💡 Hint: Think about database performance best practices.
Challenge and get performance evaluation