CTE (Common Table Expression)

A Common Table Expression (CTE) is a temporary, named result set used within a SQL query to make complex queries more organized and readable. Think of it like defining a mini-query or a reusable snippet that you can reference multiple times within your main query. CTEs are especially helpful for breaking down complicated data retrieval tasks into smaller, understandable parts, improving clarity and maintainability. They only exist during the execution of the query and do not affect the database permanently.