Answer
A CTE organizes complex queries into readable blocks and supports recursion and reusable query logic.
Quick Answer
CTE (Common Table Expression) is a named temporary result set defined with WITH, usable in the main query. WITH active_users AS (SELECT * FROM users WHERE active = true) SELECT * FROM active_users WHERE age > 18. Improves readability for complex queries. Recursive CTEs traverse hierarchical data. In PostgreSQL 12+, CTEs are inlined by default (the optimizer can push conditions inside).
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SugharaIQ Editorial Team
Verified Answer
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Source: SugharaIQ