What happens if a scalar subquery returns 0 rows?

The query crashes with an error.

easy #sql #postgresql #retail

QUESTION 01 OF 02

Introduction to Subqueries

Quiz for lesson: Introduction to Subqueries

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What constraint must a scalar subquery satisfy?

About this Quiz

This interactive assessment is designed to test your understanding of Introduction to Subqueries. 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.
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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.