Views, Materialized Views, Functions, Triggers, and Procedures

Why Database Objects Matter

Not all useful logic belongs in application code. Some logic is better centralized in reusable database objects, especially when many services or reports depend on the same business rules. PostgreSQL provides powerful database-side capabilities for these scenarios.

Views and Materialized Views

CREATE VIEW active_customers AS
SELECT customer_id, full_name, email
FROM customers
WHERE is_active = TRUE;

A standard view simplifies repeated query patterns. A materialized view stores the result physically and can help performance for repeated reporting workloads, though it needs refresh management.

Functions and Triggers

CREATE OR REPLACE FUNCTION set_updated_at()
RETURNS TRIGGER AS $$
BEGIN
    NEW.updated_at := CURRENT_TIMESTAMP;
    RETURN NEW;
END;
$$ LANGUAGE plpgsql;

Functions can encapsulate logic, and triggers can react to row changes. These tools are powerful, but advanced teams use them carefully so hidden behavior does not make systems hard to reason about.

Procedure and Maintenance Use Cases

PostgreSQL procedures and server-side functions can help with recurring jobs, controlled updates, and domain-specific data operations. They are particularly useful when multiple applications rely on the same core data behavior and need a consistent database-side implementation.