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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What SQL function would you use to count occurrences of a value?
💡 Hint: Look for functions related to counting rows.
Question 2
Easy
What clause is crucial for filtering groups in SQL?
💡 Hint: This clause comes after the GROUP BY clause.
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 does the GROUP BY clause do?
- Aggregates rows into one
- Filters data based on conditions
- Sorts the results
💡 Hint: Think about how items are organized when collecting similar things.
Question 2
Is the following statement True or False? The HAVING clause is used before the GROUP BY clause.
- True
- False
💡 Hint: Recall the order of operations in SQL queries.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Design a SQL query to find all records for users with duplicate emails, including their user IDs and creation dates.
💡 Hint: Think about using a subquery with GROUP BY and HAVING.
Question 2
Explain how to handle data integrity when imports of user data are made, particularly focusing on checking duplicates.
💡 Hint: Consider strategies that ensure quality checks before data is added.
Challenge and get performance evaluation