Computer services offer a wide range of services that include computer repair, sale of ready-made computers or assembly of computers from components requested by the client. Such processes often involve documentation such as a work order, receipt of equipment, diagnostic report, repair offer, repair certificate, invoice, and receipt of repaired goods. Five computer services in Osijek were visited as part of the primary research, which included the collection of work orders from each of the services, and after a short interview with each of the employees of a particular service, conclusions were reached about the structure of the processes that take place in computer services in the Republic of Croatia and about the scope of data that should be contained in the optimal relational database of the computer service. For this purpose, work order forms used in computer services were collected and analyzed. Entities and associated attributes are defined based on the observed data scope. The relational database was modeled using the synthesis method, and the observed uncontrolled redundancies were removed using vertical normalization. The optimal relational database model for computer service was created and tested using Oracle's relational database management system MySQL Server in the current version 8.0.33. In addition to the theoretical value, the created model also has a practical value because it can be used by business entities involved in the development of software applications as a basis in the development of software solutions intended for the operation of computer services.