Practice - Advanced Database Queries
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Practice Questions
Test your understanding with targeted questions
What does INNER JOIN do in SQL?
💡 Hint: Think about how you combine data across related tables.
Define an aggregate function.
💡 Hint: Consider what you might want to find the total or average of.
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
What type of join returns all matching records?
💡 Hint: Think about the relationship enforced by the join.
True or False: LEFT JOIN returns only matching rows.
💡 Hint: Visualize the data returned in both tables.
2 more questions available
Challenge Problems
Push your limits with advanced challenges
Create a SQL query using an aggregate function to find how many users have made orders in total.
💡 Hint: Think about how you can count unique entries.
Write a SQL query that retrieves users who have not made any orders, using a subquery.
💡 Hint: Consider how to filter non-participating users based on another table.
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Reference links
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