19.1.1 - Subqueries and Nested Queries
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Practice Questions
Test your understanding with targeted questions
What is the purpose of a subquery in SQL?
💡 Hint: Think about how one query can feed into another.
Can subqueries be used in the WHERE clause?
💡 Hint: Consider how we restrict results based on another dataset.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is a subquery?
💡 Hint: Recall how one query can influence another.
Subqueries can be used in which SQL clauses?
💡 Hint: Think of all the places we've mentioned using them.
2 more questions available
Challenge Problems
Push your limits with advanced challenges
Create a SQL query that retrieves the names of employees who earn more than the average salary of their specific department, using subqueries.
💡 Hint: Think about how to correlate the subquery with the outer query logically.
Explain under what circumstances you would prefer using a JOIN over a subquery and provide an example.
💡 Hint: Consider the relationships between tables and how to express them directly.
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