4.2 - Check if Duplicate Records Exist
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Practice Questions
Test your understanding with targeted questions
What SQL function would you use to count occurrences of a value?
💡 Hint: Look for functions related to counting rows.
What clause is crucial for filtering groups in SQL?
💡 Hint: This clause comes after the GROUP BY clause.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does the GROUP BY clause do?
💡 Hint: Think about how items are organized when collecting similar things.
Is the following statement True or False? The HAVING clause is used before the GROUP BY clause.
💡 Hint: Recall the order of operations in SQL queries.
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Challenge Problems
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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.
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.
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