"Relational Database Design and Implementation, Third Edition" is a practical guide for IT professionals to improve their skills in creating and managing databases. The book covers basic database concepts, SQL for database creation, and important topics like data normalization and Codd's Rules. It includes real-world case studies and new chapters on database implementation and management. The book teaches principles for good database design, methods to tailor design to specific needs, and techniques to ensure data accuracy and performance. It also explains object-relational design, normalization techniques, and tools for database design.