Referential integrity is a relational database concept, which states that table relationships must always be consistent. In other words, any foreign key field must agree with the primary key that is referenced by the foreign key. Thus, any primary key field changes must be applied to all foreign keys, or not at all. The same restriction also...
A massively multiplayer online game (MMOG) refers to videogames that allow a large number of players to participate simultaneously over an internet connection. These games usually take place in a shared world that the gamer can access after purchasing or installing the game software. The explosive growth in MMOGs has prompted many game designers to build online multiplayer modes into many traditionally single-player games.
Massively multiplayer online role playing games (MMORPGs) are one the most popular forms of a MMOG, but the concept goes far beyond a single genre. In addition to RPGs and real-time strategy (RTS) games, the online gameplay has become an essential feature in many first person shooters (FPS), racing games and even fighting games. For many gamers, the ability to compete with players from all over the world in a variety of online-only game modes overshadows the single player mode that many of these games were originally designed around.
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