SQL Interview Questions and Answers

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In this video, Faisal Nadeem shared 9 most important sql interview questions and answers or sql developer interview questions and answers or sql interview questions and answers for freshers or sql job training or sql interview questions and answers for experienced or sql work completely explained by @Knowledge Topper with suitable examples.

Q1) What is SQL?
Answer: SQL stands for Structured Query Language. It’s used to communicate with and manage data in a relational database.

Q2) What is a subquery in SQL?
Answer: A subquery is a query nested inside another query to retrieve data used by the outer query.

Q3) What is a primary key?
Answer: A primary key is a unique identifier for each record in a table. It cannot be null or duplicated.

Q4) What is a foreign key?
Answer: A foreign key is a field in one table that links to the primary key in another table, creating a relationship between the two.

Q5) What is the difference between WHERE and HAVING?
Answer: WHERE filters rows before grouping; HAVING filters groups after aggregation.

Q6) What is a JOIN in SQL?
Answer: A JOIN is used to combine rows from two or more tables based on a related column between them.

Q7) What is normalization?
Answer: Normalization is the process of organizing data to reduce redundancy and improve data integrity.

Q8) How do you find duplicate records in a table?
Answer: By using GROUP BY with HAVING COUNT(*) 1 on the target column.

Q9) Why do you want to work with SQL?
Answer: Because I enjoy working with structured data and solving problems by writing clear and efficient queries.


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