How do you select only the most recent order for each customer using ROW_NUMBER()?

By using ROW_NUMBER() partitioned by customer_id, ordered by order_date DESC inside a CTE, then filtering WHERE rn = 1 in the outer query.

GROUP BY customer_id HAVING ROW_NUMBER() = 1

easy #sql #postgresql #retail

QUESTION 01 OF 02

ROW_NUMBER

Quiz for lesson: ROW_NUMBER

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What does ROW_NUMBER() guarantee in its output?

About this Quiz

This interactive assessment is designed to test your understanding of ROW_NUMBER. 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.

Instructions

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.