SQL Interview Questions and Answers

Description:
In this video, Faisal Nadeem shared 10 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 (Structured Query Language) is used to store, retrieve, and manipulate data in relational databases like MySQL, SQL Server, and PostgreSQL.

Q2) What are the different types of SQL statements?
Answer: SQL statements include DDL (Data Definition), DML (Data Manipulation), DCL (Data Control), and TCL (Transaction Control).

Q3) What is the difference b/w INNER JOIN & LEFT JOIN?
Answer: INNER JOIN returns only matching rows from both tables.
While LEFT JOIN returns all rows from the left table and matching rows from the right table (or NULL if no match).

Q4) What is a subquery?
Answer: A subquery is a query nested inside another SQL query. It can be used in SELECT, WHERE, or FROM clauses.

Q5) What is normalization?
Answer: Normalization organizes data to reduce redundancy and improve integrity using forms like 1NF, 2NF, 3NF, etc.

Q6) What is a view in SQL?
Answer: A view is a virtual table created using a SELECT query. It simplifies complex queries and enhances security.

Q7) What is a stored procedure?
Answer: A stored procedure is a set of SQL statements stored in the database that can be executed repeatedly with optional parameters.

Q8) What is an index in SQL?
Answer: An index improves the speed of data retrieval but may slow down inserts and updates. It works like a lookup table for faster access.

Q9) How do you avoid SQL injection?
Answer: Use prepared statements, parameterized queries, input validation, and avoid dynamic SQL wherever possible.

Q10) What is a JOIN in SQL?
Answer: A JOIN combines rows from two or more tables based on a related column.




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