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Back to Problems

1098. Unpopular Books

Medium43.3% AcceptancePremium
Database
ProblemSolutionsVideosNotes

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Leetcode Interviews

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Similar Problems

Combine Two TablesEasy
Second Highest SalaryMedium
Nth Highest SalaryMedium
Rank ScoresMedium
More similar problems

Related Topics

Database

Problem Stats

Acceptance Rate43.3%
DifficultyMedium

Practice on LeetCode

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Frequently Asked Questions

Is Unpopular Books asked in FAANG interviews?

Database query problems involving joins, filtering, and aggregation are common in technical interviews, including FAANG-style assessments. While this exact problem may not appear, similar SQL patterns are frequently tested.

What is the optimal approach for Unpopular Books?

The optimal approach uses a LEFT JOIN between the Books and Orders tables combined with aggregation. By summing order quantities within a specific date range and filtering with HAVING, you can identify books whose total sales fall below the required threshold.

What SQL concepts are important for solving Unpopular Books?

Key SQL concepts include LEFT JOIN, GROUP BY, SUM aggregation, and date filtering with WHERE clauses. Understanding how to handle NULL values for books without orders is also important.

What data structure or database technique is best for Unpopular Books?

In SQL-based problems like this, relational joins and aggregation functions act as the main tools rather than traditional data structures. Indexes on book_id and date columns can significantly improve query performance.