This report presents the design, development, and evaluation of a relational database system tailored for a modern tech marketing environment. It begins with an introduction to SQL and the use of SQL Server Management Studio (SSMS) for database design, including elements like schema, tables, columns, data types, keys, relationships, and diagrams. The report then details the creation of a comprehensive system design, encompassing user interface (UI) designs for login, dashboards, product forms, and employee/customer management, along with the application of data validation techniques such as data type, code, range, format, consistency, and uniqueness checks. Furthermore, it covers data normalization up to the third normal form (3NF) to ensure data integrity. The report evaluates the effectiveness of the design in relation to both user and system requirements, followed by the implementation of a fully functional relational database system, including constraints, joins, and database maintenance using SQL queries. Database security aspects like authentication, backups, and encryption are also addressed. The report concludes with the testing of the system against user and system requirements and provides technical and user documentation including flowcharts and user manuals for various system components. References and tools used are also provided.