Composite indexes in SQL are multi-column indexes that help optimize queries involving more than one column. This quiz on SQL composite indexes helps test your understanding of when and how to use composite indexes for better performance.
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What is the correct syntax to create a composite index on first_name and last_name?
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Question 3 of 15
3. Question
Which of the following queries would benefit most from a composite index on (city, age)?
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Question 4 of 15
4. Question
In a composite index (col1, col2), which column is searched first during index lookup?
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Question 5 of 15
5. Question
Can a composite index improve query performance?
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Question 6 of 15
6. Question
What happens if only the second column in a composite index is used in the WHERE clause?
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Question 7 of 15
7. Question
Which of the following is TRUE about composite indexes?
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Question 8 of 15
8. Question
Which of the following is a disadvantage of composite indexes?
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Question 9 of 15
9. Question
How many columns can be included in a composite index (generally)?
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Question 10 of 15
10. Question
When does a composite index provide no performance benefit?
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Question 11 of 15
11. Question
Which operation benefits from composite indexes in addition to WHERE conditions?
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Question 12 of 15
12. Question
What is the role of a covering index in the context of composite indexes?
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Question 13 of 15
13. Question
Which clause lets you include non-key columns in a non-clustered composite index (SQL Server)?
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Question 14 of 15
14. Question
Which statement is FALSE about composite indexes?
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Question 15 of 15
15. Question
When defining a composite index, which factor is most important?
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Summary
Composite indexes are essential for improving query speed on multiple columns used together in filters or joins. This quiz on SQL composite indexes covers definitions, behavior, order sensitivity, and use cases of composite indexes in SQL databases.
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