Tham khảo tài liệu 'managing time in relational databases- p2', công nghệ thông tin, cơ sở dữ liệu phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | xxii PREFACE bi-temporal constructs and transformations. If IT and business management in your own organizations are wise and if your initial implementations are successful then your organizations will be positioned on the leading edge of a revolution in the management of data a position from which business advantage over trailing edge adopters will continue to be enjoyed for many years. Theory is practical as we hope this book will demonstrate. But the relationship of theory and practice is a two-way street. Computer scientists are theoreticians working from theory down to practice from mathematical abstractions to their best understandings of how those abstractions might be put to work. IT professionals are practitioners working from specific problems up to best practice approaches to classes of similar problems. Common ground can sometimes be reached ground where the best understandings of computer scientists meet the best practices of IT professionals. Here theoreticians may glimpse the true complexities of the problems to which their theories are intended to be relevant. Here practitioners may glimpse the potential of powerful abstractions to make their best practices even better. We conclude with an example and a maxim about the interplay of theory and practice. The example Leonard Euler one of history s greatest mathematicians created the field of mathematical graph theory while thinking about various paths he had taken crossing the bridges of Konigsberg Germany during Sunday afternoon walks. The maxim to paraphrase Immanuel Kant one of history s greatest philosophers theory without practice is empty practice without theory is blind . Glossary References Glossary entries whose definitions form strong interdependencies are grouped together in the following list. The same glossary entries may be grouped together in different ways at the end of different chapters each grouping reflecting the semantic perspective of each chapter. There will usually be several .
