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Roadmap to becoming a developer in 2022
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developer-roadmap/src/data/roadmaps/sql/content/common-table-expressions@te...

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CTEs (Common Table Expressions)

Common Table Expressions (CTEs) in SQL are named temporary result sets that exist within the scope of a single SELECT, INSERT, UPDATE, DELETE, or MERGE statement. Defined using the WITH clause, CTEs act like virtual tables that can be referenced multiple times within a query. They improve query readability, simplify complex queries by breaking them into manageable parts, and allow for recursive queries. CTEs are particularly useful for hierarchical or graph-like data structures and can enhance query performance in some database systems.

Learn more from the following resources: