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 smartphone is a mobile phone with highly advanced features. A typical smartphone has a high-resolution touch screen display, WiFi connectivity, Web browsing capabilities, and the ability to accept sophisticated applications. The majority of these devices run on any of these popular mobile operating systems: Android, Symbian, iOS, BlackBerry OS and Windows Mobile.
A smartphone is expected to have a more powerful CPU, more storage space, more RAM, greater connectivity options and larger screen than a regular cell phone.
High-end smartphones now run on processors with high processing speeds coupled with low power consumptions. That means, they’ll allow you to play 3D games, browse the Web, update your Facebook account, call, and text much longer than you used to.
In addition to the features mentioned earlier, smartphones are also equipped with innovative sensors like accelerometers or even gyrscopes. Accelerometers are responsible for displaying screens in portrait and landscape mode, while gyroscopes make it possible for games to support motion-based navigation.
The earliest touch screen smartphones used resistive touchscreen displays, which required the use of slender pointing objects known as styli (or stylus in singular form). Most of the later models however, like the iPhone and most Android phones, employ capacitive displays, which feature multi-touch finger gestures.
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