advanced~4h
CTEs — Common Table Expressions & Recursive CTEs
A Common Table Expression (CTE) is a named temporary result set defined within a WITH clause, available for the duration of the query. CTEs improve readability, enable recursion, and can replace compl
Learning objectives
- Explain what a CTE gives you that a subquery doesn't, beyond naming it.
- Trace exactly how a recursive CTE builds its result set, iteration by iteration.
- Recognize when PostgreSQL's CTE inlining behavior means a CTE carries no extra cost versus an equivalent subquery.
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CTEs — Common Table Expressions & Recursive CTEs