50 Important Databases Interview Questions

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Data Structures & Algorithms Data Structures
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Machine Learning & Data Science Machine Learning

Databases are organized collections of data that allow efficient information retrieval, modification, and storage. They form the backbone of a wide array of applications, from simple web apps to large-scale data analytics systems. In tech interviews, candidates are often questioned on their understanding of database design, SQL (Structured Query Language), database management systems (DBMS), and core principles of relational and non-relational databases. This blog post will delve into the most common Databases interview questions and provide comprehensive answers to equip you for your next tech interview.

Content updated: January 1, 2024

Database Fundamentals



SQL and Query Optimization


  • 11.

    How would you write an SQL query to fetch duplicate records from a table?

    Answer:
  • 12.

    What is a prepared statement, and why would you use one?

    Answer:
  • 13.

    What is the N+1 query problem and how can you solve it?

    Answer:
  • 14.

    Explain the function of GROUP BY and HAVING clauses in SQL.

    Answer:
  • 15.

    What are indexes and how do they work in databases?

    Answer:
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