Description: Nested queries are a type of SQL query that are embedded within other queries. This approach allows for more efficient and organized data retrieval from a database, as the inner query can act as a filter or a set of results that the outer query uses to perform its operation. Nested queries are particularly useful when complex operations require multiple steps of data filtering or aggregation. By using this method, developers can simplify the logic of their queries, making the code more readable and maintainable. Additionally, nested queries can improve performance by reducing the amount of data processed in the outer query, as only relevant results from the inner query are used. In summary, nested queries are a powerful tool in SQL query optimization, enabling users to perform more complex operations efficiently and effectively.
