SQL Flashcards
What is a CTE?
CTE is a temporary result set that simplifies complex queries, enhancing readability and maintainability.
How is a CTE structured?
Defined with a WITH clause, providing a static result set without self-referencing.
How does a CTE behave?
Evaluated once, with results usable in subsequent query parts, but lacking iterative capabilities.
How does a recursive CTE differ from a normal CTE?
It self-references.
This enables iterative processing, often for hierarchical data or repetitive tasks until specified conditions are met.
How is a recursive CTE structured?
It comprises an Anchor Member (the initial query) and Recursive Member (a self-referencing query).
How does a recursive CTE behave?
It iteratively builds results until conditions are no longer met. Thus us useful for hierarchical traversal or result accumulation.