How views simplify queries

Create a view

A view stores a query definition, not a copied result, in ordinary SQLite usage.

CREATE VIEW active_courses AS
SELECT id, title, level
FROM courses
WHERE active = 1;

Query it like a table

Consumers can select and filter the view without repeating its underlying joins or conditions.

SELECT title
FROM active_courses
WHERE level = 'beginner';

Use views as interfaces

Views can centralize a trusted calculation, hide irrelevant columns, and give complex joins a stable name.

Know the limits

Changing data through a view varies by database. Simple PostgreSQL and MySQL views may be updatable; SQLite views are read-only unless triggers implement changes. Ordinary views do not automatically improve performance.