This book aims to shed light on the implementation of standardized transactional databases in a rigorous manner. By presenting the steps of the realization according to the approach proposed by the method of study and computer realization of the advanced systems. It is an R&D approach intended for professionals and researchers in computer sciences wishing to set up databases respecting the standards (FN). This approach starts with the identification of the needs of the final users of the database, continues with a systematic application of the steps of the approach proposed by the MERISE method and ends with an implementation of the database with a verification of the expected results of the database via the SQL queries.