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Oracle
Oracle Corporation is an American multinational computer technology corporation headquartered in Redwood City, California, United States. The company specializes in developing and marketing computer hardware systems and enterprise software products – particularly its own brands of database management systems. Oracle is the third-largest software maker by revenue, after Microsoft and IBM.[3]
The company also builds tools for database development and systems of middle-tier software, enterprise resource planning software (ERP), customer relationship management software (CRM) and supply chain management (SCM) software.
Larry Ellison, a co-founder of Oracle, has served as Oracle's CEO throughout its history. He also served as the Chairman of the Board until his replacement by Jeffrey O. Henley in 2004. On August 22, 2008, the Associated Press ranked Ellison as the top-paid chief executive in the world.[4][5]
MySql
MySQL (/maɪ ˌɛskjuːˈɛl/ "My S-Q-L",[4] officially, but also called /maɪ ˈsiːkwəl/ "My Sequel") is (as of July 2013) the world's most widely used[5][6] open-source relational database management system (RDBMS)[7] that runs as a server providing multi-user access to a number of databases, though SQLite probably has more total embedded deployments.[8] It is named after co-founder Michael Widenius's daughter, My.[9] The SQL phrase stands for Structured Query Language.[4]
The MySQL development project has made its source code available under the terms of the GNU General Public License, as well as under a variety of proprietary agreements. MySQL was owned and sponsored by a single for-profit firm, the Swedish company MySQL AB, now owned by Oracle Corporation.[10]
MySQL is a popular choice of database for use in web applications, and is a central component of the widely used LAMP open source web application software stack (and other 'AMP' stacks). LAMP is an acronym for "Linux, Apache, MySQL, Perl/PHP/Python." Free-software-open source projects that require a full-featured database management system often use MySQL.
For commercial use, several paid editions are available, and offer additional functionality. Applications which use MySQL databases include: TYPO3, MODx, Joomla, WordPress, phpBB, MyBB, Drupal and other software. MySQL is also used in many high-profile, large-scale websites, including Wikipedia,[11] Google[12][13] (though not for searches), Facebook,[14][15][16] Twitter,[17] Flickr,[18] and YouTube.[19]
SQL
SQL (/ˈɛs kjuː ˈɛl/ "S-Q-L"[4]; Structured Query Language[5][6][7][8]) is a special-purpose programming language designed for managing data held in a relational database management system (RDBMS).
Originally based upon relational algebra and tuple relational calculus, SQL consists of a data definition language and a data manipulation language. The scope of SQL includes data insert, query, update and delete, schema creation and modification, and data access control. Although SQL is often described as, and to a great extent is, a declarative language (4GL), it also includes procedural elements.
SQL was one of the first commercial languages for Edgar F. Codd's relational model, as described in his influential 1970 paper "A Relational Model of Data for Large Shared Data Banks".[9] Despite not entirely adhering to the relational model as described by Codd, it became the most widely used database language.[10][11]
SQL became a standard of the American National Standards Institute (ANSI) in 1986, and of the International Organization for Standards (ISO) in 1987.[12] Since then, the standard has been enhanced several times with added features. Despite these standards, code is not completely portable among different database systems, which can lead to vendor lock-in. The different makers do not perfectly adhere to the standard, for instance by adding extensions, and the standard itself is sometimes ambiguous.