A Spring Boot RESTful Web Service with a complete database model design and structure, Spring Security implementation, clean code with MVC and different layers, and implementation of complex logics is a modern, scalable, and secure way to create robust and reliable web services.

The service will be built using the Spring Boot framework, which provides a fast and lightweight way to create RESTful web services. A complete database model design and structure will be created to ensure that the data is organized efficiently and stored in a secure manner. This will involve designing the database schema, creating tables and columns, defining relationships and constraints, and optimizing the database for performance and scalability.

Spring Security implementation will ensure that the service is secure and only authorized users have access to it. This will involve setting up authentication and authorization mechanisms, implementing user roles and permissions, and integrating with third-party identity providers. This will make sure that the service is protected against malicious attacks and that sensitive data is secure.

Clean code with MVC and different layers means that the codebase will be organized in a way that is maintainable, scalable, and easy to understand. The service will be designed using the Model-View-Controller (MVC) architecture, which will allow for clear separation of concerns between different layers of the code. This will make it easier to update and extend the service in the future.

Implementing complex logics means that the service will be able to handle complex business logic and rules. This will involve creating custom algorithms for data processing, handling complex queries, implementing caching strategies, and integrating with external services or APIs. This will make the service more flexible and adaptable to a wide range of use cases.