What is a CTE and why use one?

SQL subqueries, CTEs and set operations · Freshers and experienced

Model answer

A common table expression is a named temporary result defined with WITH and used in the main query: WITH recent AS (SELECT ...) SELECT * FROM recent. CTEs make long queries readable, can be referenced several times, and support recursion.

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Subqueries, EXISTS and CTEs: Queries Inside Queries in the course SQL for Beginners: Learn Databases Step by Step.

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