27 ноя 1976 г. - 1976
Описание:
A new database model called Entity-Relationship, or ER, was proposed by P. Chen this year. This model made it possible for designers to focus on data application, instead of logical table structure.Добавлено на ленту времени:
Дата:
27 ноя 1976 г.
Сейчас
~ 48 г назад