Recursive Common Table Expressions (CTEs) and Oracle's CONNECT BY are widely used SQL constructs that enable the delegation of complex data structure exploration to the database layer for enhanced processing efficiency. These constructs are crucial for querying interdependent data structures, a common requirement across various industries. However, NoSQL databases often prioritize scalability and high availability over CTE support, leading developers to turn to specialized solutions like graph databases. Couchbase SQL++, on the other hand, offers a unique approach to Recursive CTEs through its SQL++ construct, allowing users to leverage a single DBMS for complex data structures without the need for dedicated databases. The use of CTEs in Couchbase SQL++ enables developers to efficiently query and transform complex relationship data using familiar SQL constructs. To ensure optimal performance, it is essential to follow best practices, such as setting limits on recursion depth, monitoring performance closely, avoiding unnecessary complexity, ensuring correct data structure, testing extensively, and setting the memory quota. Despite their benefits, Recursive CTEs in Couchbase SQL++ are subject to limitations, including restrictions on aggregate functions, window functions, LIMIT / ORDER BY clauses, and performance considerations. By understanding these constructs and best practices, developers can unlock the full potential of CTEs in Couchbase SQL++.