Description: A query that uses a Common Table Expression defined recursively, known as a recursive CTE, allows for complex queries in SQL databases. This technique is particularly useful for working with hierarchical or tree-like structures, such as those found in organizational charts, categorizations, or any other type of relationship that requires traversing through levels. The recursive CTE consists of two parts: an anchor member that establishes the starting point and a recursive member that calls itself to obtain additional results. This structure enables developers and data analysts to perform operations that would otherwise be difficult to implement using traditional SQL queries. Recursive CTEs are valued for their clarity and readability, as they allow for expressing the logic of the query more intuitively than complex subqueries or joins. Additionally, their use can improve performance compared to other techniques, as they optimize data access and reduce the need for multiple passes over the same information.
