In complex database testing, what is the advantage of using subqueries in SQL?

Subqueries in SQL provide the advantage of handling multiple nested queries within a single SQL statement. This simplifies the query structure, making it more readable and maintainable. Additionally, subqueries allow for better organization of complex database tests, leading to improved performance by reducing the number of individual queries. Testers can use subqueries to encapsulate logic and create more modular and efficient database tests, especially when dealing with scenarios that involve multiple levels of data retrieval and manipulation.