Practice Check If Duplicate Records Exist (4.2) - SQL for Business Analysts

Practice: Check if Duplicate Records Exist

Lesson 4.2SQL for Business Analysts

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9 questions

Flashcard drill
3 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What SQL function would you use to count occurrences of a value?
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Look for functions related to counting rows.
Question 2.
What clause is crucial for filtering groups in SQL?
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This clause comes after the GROUP BY clause.
3Question 3.
What does the GROUP BY clause do?
- Aggregates rows into one
- Filters data based on conditions
- Sorts the results
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Think about how items are organized when collecting similar things.
4Question 4.
Is the following statement True or False? The HAVING clause is used before the GROUP BY clause.
- True
- False
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Recall the order of operations in SQL queries.
Question 5.
Design a SQL query to find all records for users with duplicate emails, including their user IDs and creation dates.
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Think about using a subquery with GROUP BY and HAVING.
Question 6.
Explain how to handle data integrity when imports of user data are made, particularly focusing on checking duplicates.
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Consider strategies that ensure quality checks before data is added.

5 more questions in this section. Enroll free to practise them all.