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...
Apps have helped shape the leaders in mobile technology. Apple Inc., which was first out of the gate with the promotion of its App Store in 2008, gained a large chunk of market share with its iPhone. Apps were part of the iPhone's initial draw. Android has since gained ground with its Android Market, which peddles apps for Android-based phones.
Apps are also effecting a shift for online businesses, which are often accessed through an app on a mobile device, rather than over the Web. As a result, websites that get most of their revenue through online ads have had to consider what apps mean to their business model.
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