Journal of Theoretical and Applied Information Technology
In this paper the authors conduct an analysis of sales and inventory systems that exist in the company, then designing a data warehouse for PT. Delta Djakarta, Tbk. to support the decision-making process in estimating the number of sales in the future, then found the existing problems and provide solutions to the company so that the company can overcome the existing problems and provide the best service to its customers. The method used in this paper is a nine step methodology that is a model of systematic data warehouse in building data warehouse.