Normalization (1NF to BCNF) - constraints enforce normalized structure

Indexing Strategies - foreign keys need indexes

Triggers & Stored Procedures - complex validation beyond CHECK constraints

Transaction Control (ACID) - constraints are checked within transactions

Views & Materialized Views - can include constraints

Create a banking schema with CHECK constraints for positive balances and valid account types

Implement CASCADE DELETE for a blog platform (users, posts, comments)

Add constraints to an existing schema and test violation scenarios

Design constraints for an e-commerce order system with business rules

Create indexes on all foreign keys and measure DELETE performance improvement

Explain CASCADE, SET NULL, and RESTRICT for ON DELETE actions

Why should foreign key columns always be indexed?

What is the difference between application validation and database constraints?

Design a social media schema with appropriate constraints

How would you handle constraint violations in production?

PostgreSQL Documentation - Constraints

Database Design for Mere Mortals - Constraint Patterns

SQL Performance Explained - Index Foreign Keys

GDPR Compliance - CASCADE DELETE Strategies