Unlocking the Secrets of SQL Mastery: A Comprehensive Guide to Tackling Top Interview Questions

Unlock door of your success in SQL World

Photo by Alora Griffiths on Unsplash

In the dynamic landscape of technical interviews, SQL proficiency stands as a cornerstone skill, particularly in data-centric roles. Whether you’re vying for a coveted position in data analysis, database administration, or software engineering, mastering SQL is paramount to demonstrating your capability to handle diverse data-related challenges.

In this comprehensive guide, we delve into 15 of the most intriguing SQL interview questions that have been known to stump even the most seasoned candidates. Drawing upon decades of collective expertise, we not only provide detailed explanations but also offer meticulously crafted code examples for each query, ensuring a thorough understanding of the concepts at hand.

1. Order of Execution of SQL Query

Understanding the order of execution is crucial for optimizing query performance. SQL queries are executed in the following sequence:

SELECT 
  columns
FROM 
  tables
WHERE 
  conditions
GROUP BY 
  columns
HAVING 
  conditions
ORDER BY 
  columns
LIMIT 
  n;

1. FROM: Tables and views are selected.
2. WHERE: Filters rows based on…