The DISTINCT keyword in SQL removes duplicate values from query results. It ensures that only unique rows or values are returned, especially when dealing with repeated entries in columns or combinations of columns.
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What is the purpose of the DISTINCT keyword in SQL?
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Question 2 of 15
2. Question
Which clause is DISTINCT used with in SQL?
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Question 3 of 15
3. Question
What will this query return?
SELECT DISTINCT department FROM employees;
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Question 4 of 15
4. Question
How many columns can DISTINCT apply to?
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Question 5 of 15
5. Question
What is the result of this query?
SELECT DISTINCT name, department FROM employees;
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Question 6 of 15
6. Question
Which keyword is the opposite of DISTINCT?
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Question 7 of 15
7. Question
Which query correctly removes duplicate job titles?
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Question 8 of 15
8. Question
What happens when DISTINCT is used with ORDER BY?
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Question 9 of 15
9. Question
What does SELECT DISTINCT NULL FROM students; return?
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Question 10 of 15
10. Question
Which one shows all city names without repetition?
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Question 11 of 15
11. Question
What is the default behavior of SQL if DISTINCT is not used?
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Question 12 of 15
12. Question
Which is true about DISTINCT and GROUP BY?
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Question 13 of 15
13. Question
How can you count unique departments?
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Question 14 of 15
14. Question
What will happen if you use DISTINCT with *?
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Question 15 of 15
15. Question
What does this query do?
SELECT DISTINCT city, state FROM locations;
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Summary
The DISTINCT keyword in SQL is essential for removing duplicates and ensuring unique results in queries. It helps simplify data analysis, improve clarity, and generate meaningful reports.
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