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What is a CTE (Common Table Expression)?

Q: What is a CTE (Common Table Expression)?

A **CTE** (`WITH name AS (...)`) defines a named, temporary result set used within a single query — improving readability over nested subqueries. **Recursive CTEs** can traverse hierarchies/graphs (e.g. org charts, tree structures).

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Explain WITH clauses.

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A CTE (WITH name AS (...)) defines a named, temporary result set used within a single query — improving readability over nested subqueries. Recursive CTEs can traverse hierarchies/graphs (e.g. org charts, tree structures).

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