Views in PostgreSQL: A Complete Guide with Examples

PostgreSQL views are virtual tables defined by queries — they simplify complex operations, enforce security boundaries, and improve maintainability. This guide covers all 6 types: Simple views wrap single-table queries for abstraction. Complex views join multiple tables with aggregations. Materialized views pre-compute and cache results on disk — dramatically faster for expensive queries but require manual refresh.

Updatable views allow INSERT/UPDATE/DELETE operations that pass through to base tables. Read-only views with WITH CHECK OPTION prevent modifications. Recursive views handle hierarchical data like org charts using CTEs. Real e-commerce examples demonstrate each type: product catalogs (simple), order summaries (complex), sales dashboards (materialized).

Best practices include refreshing materialized views during off-peak hours, using CONCURRENTLY to avoid locks, and creating indexes on materialized views for query performance.