Using Common Table Expressions (CTEs) in SQL can be beneficial in many cases, depending on the specific requirements of your query and the complexity of your data. Here are some reasons why CTEs can be useful:

1. Code readability and maintainability: CTEs allow you to break down complex queries into smaller, more manageable parts. This improves the readability of your code and makes it easier to understand and maintain.
2. Code reuse: With CTEs, you can define a query once and refer to it multiple times within the same query or in subsequent queries. This promotes code reuse, reduces redundancy, and simplifies changes and updates.
3. Recursive queries: CTEs are commonly used for writing recursive queries, which are queries that refer back to themselves. Recursive queries can be used to traverse hierarchical data structures or perform operations that require iterative processing.
4. Simplified complex queries: CTEs can simplify complex queries by breaking them down into logical steps. Each CTE can represent a specific part of the overall query, making it easier to understand and debug.
5. Performance optimization: In some cases, using CTEs can improve query performance. The query optimizer in the database engine may be able to optimize the execution plan when using CTEs, leading to faster query execution.

However, it’s important to note that CTEs are not always the best solution for every situation. Depending on the specific scenario and the database engine you’re using, there might be alternative approaches or optimizations that can achieve better performance. It’s always recommended to analyze the specific requirements, test different approaches, and measure the performance to determine the most suitable solution for your case.