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The system was pursued to develop in order to create synergies between AMR, Marriott, Hilton Hotels Corporation and Budget Rent-A-Car and fully integrate and unify the reservation systems of the companies involved. In 1988 the four large corporations made contracts to complete the system by June 1992 project at a cost of $55 million.
Diagrams created to represent attributes as well as entities and relationships may be called entity-attribute-relationship diagrams, rather than entity–relationship models. An ER model is typically implemented as a database. In a simple relational database implementation, each row of a table represents one instance of an entity type, and each ...
The C4 model relies at this level on existing notations such as Unified Modelling Language (UML), Entity Relation Diagrams (ERD) or diagrams generated by Integrated Development Environments (IDE). For level 1 to 3, the C4 model uses 5 basic diagramming elements: persons, software systems, containers, components and relationships.
The MARS-1 train ticket reservation system was designed and planned in the 1950s by the Japanese National Railways' R&D Institute, now the Railway Technical Research Institute, with the system eventually being produced by Hitachi in 1958. [6] It was the world's first seat reservation system for trains. [7]
Hoteling is reservation-based unassigned seating; employees reserve a workspace before they come to work in an office. An alternate method of handling unassigned seating is hot desking, which does not involve reservations; with hot-desking, a worker chooses a workspace upon arrival, rather than reserving it in advance. The use of the term has ...
Sabre Global Distribution System, owned by Sabre Corporation, [1] is a travel reservation system used by travel agents and companies to search, price, book, and ticket travel services provided by airlines, hotels, car rental companies, rail providers and tour operators.
The enhanced entity–relationship (EER) model (or extended entity–relationship model) in computer science is a high-level or conceptual data model incorporating extensions to the original entity–relationship (ER) model, used in the design of databases.
It is important to distinguish between the UML model and the set of diagrams of a system. A diagram is a partial graphic representation of a system's model. The set of diagrams need not completely cover the model and deleting a diagram does not change the model. The model may also contain documentation that drives the model elements and ...