This chapter focuses on writing queries inside other queries, which are known as subqueries or nested queries.
Subqueries allow SQL to perform complex logic by using the result of one query inside another query.
They are commonly used to compare values, filter records, and perform advanced data analysis.
This chapter is very important for interviews and real projects because many real-world problems require nested SQL logic.
After completing this chapter, students will be able to write advanced SQL queries with confidence.