Storing and processing business information is a precondition for the successful operation of any organization. Data such as employee information, sales, bookings, expenses, revenue are most often stored in databases from which they can be retrieved and used as such or additionally processed. When creating such large collections of data, the emphasis should be on maintaining a clear data structure, preserving the accuracy and integrity of the data, and structuring the data according to the needs of the particular business. For this purpose, business rules are implemented into the database structure itself. Business rules can be implemented in many ways, such as setting data constraints, defining cardinalities between entities, validating data entry or data modification and translating business constraints from a real business system into the database. Implementing such rules promptly avoids future problems such as inconsistency and inaccuracy of data whose correction is a costly and time-consuming process. This paper describes the procedure for the entire creation and business rule implementation process using the example of a cruise management application, resulting in a functional SQL database that integrates data and business rules. Creating the database, data definition and data manipulation are implemented using MSQL database management system. The application is developed by C# a programming language built into .NET Framework (integrated development Environment where C# code is written).