How do indexes affect SQL write performance?

Indexes speed reads but slow writes because each insert, update, or delete may also update index structures. In an interview, support it with one tradeoff and one production example.

What is a deadlock in SQL databases?

A deadlock occurs when transactions wait on each other's locks and none can proceed. In an interview, support it with one tradeoff and one production example.

How do you choose between SQL and NoSQL?

Choose based on data shape, query patterns, consistency needs, transaction requirements, scale model, and team operational experience. In an interview, support it with one tradeoff and one production example.

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Framework GuideSql4 min readUpdated Jul 16, 2026

Top 5 SQL Interview Question

Top 5 SQL Interview Question uses verified RivoHire qbank answers. Start with the strongest short answer, then review tradeoffs, scenarios, mistakes, and interview wording.

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RivoHire Editorial

Framework Guide

SqlSqlDatabaseTop 5 Sql Interview Question

Quick outcome

By the end of this guide, you will:

What is SQL?

Concept Map

Top 5 SQL Interview Question uses verified RivoHire qbank answers. Start with the strongest short answer, then review tradeoffs, scenarios, mistakes, and interview wording.

Quick Summary

Topic	Questions	Source	Company Claims
Sql	5	MongoDB qbank	Only shown when present in qbank

Question Cards

Coding question collection

Interview Questions With Code Practice

Each question includes the prompt, interview explanation, language tabs, a code-editor style solution, and time and space complexity notes.

Difficulty Distribution

Junior: 1

1. What is SQL?

A strong answer should define the SQL concept in the question, show the correct usage or example, and mention the practical impact on correctness, maintainability, performance, or user experience.

I would include the practical use case and any accessibility or validation concern.

Mention edge cases before writing code, then finish with time and space complexity.

Code solution is not generated for this question yet. Regenerate AI answers for the qbank record to store language-wise code, sample input, and expected output in the database.

Time Complexity

O(n)

Space Complexity

O(1)

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FAQ

What are the types of SQL commands?

A strong answer should define the SQL concept in the question, show the correct usage or example, and mention the practical impact on correctness, maintainability, performance, or user experience. In an interview, support it with one tradeoff and one production example.

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Practice this topic before the interview

Turn the article into spoken practice and get feedback on clarity, confidence, and technical depth.

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