Structured Query Language (SQL) is the foundation of database management, making it one of the most asked topics in technical interviews. Preparing with the right SQL interview questions can help you showcase both theoretical understanding and practical problem-solving skills.

Basic questions often cover SQL commands (DDL, DML, DCL, TCL), differences between SQL and NoSQL, and key concepts like primary keys, foreign keys, and normalization. You may also be asked to write simple queries using SELECT, JOIN, or GROUP BY.

For intermediate to advanced roles, interviewers focus on indexes, views, stored procedures, triggers, and window functions. Real-world challenges like finding duplicate records, retrieving the nth highest salary, or optimizing queries are also common.

By practicing these SQL interview questions, you can confidently demonstrate your database expertise, query-writing skills, and ability to handle performance issues effectively during job interviews.