If you have a composite index on (brand, category_id), can it optimize a query filtering only on category_id?

Yes, composite indexes work on any column order.

No, the query must include the leading column (brand) of the index key to traverse the tree path.

Only if category_id contains no nulls.

hard #sql #postgresql #retail

QUESTION 01 OF 02

B-tree Indexes

Quiz for lesson: B-tree Indexes

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How does a B-tree index optimize range queries (e.g. price BETWEEN 10 AND 50)?

About this Quiz

This interactive assessment is designed to test your understanding of B-tree Indexes. Whether you are a beginner looking to grasp the basics or an experienced professional aiming to refine your skills, quizzes are an excellent way to validate your knowledge and identify areas for improvement.

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Read each question carefully before answering.
Some questions may have multiple correct answers.
There is no time limit, so take your time to think.
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Learning Outcomes

Self-assess your current skill level.
Reinforce key concepts through active recall.
Identify knowledge gaps to focus your study.
Gain confidence in your technical expertise.
Reinforce memory and recall.