A database is an integrated collection of logically related records or files consolidated into a common pool that provides data for one or more multiple uses. You can think of a database as an electronic filing system.
Software that organizes the storage of data. A DBMS controls the creation, maintenance, and use of the database storage structures of organizations and of their end users. In large organizations this task is being manned by a Database Administrator
Database management systems are usually categorized according to the database model that they support, such as the network, relational or object model. The model tends to determine the query languages that are available to access the database. One commonly used query language for the relational database is SQL, Database management systems range from all systems that run on personal computers to huge systems that run on mainframes. After storage a DBMS needs an application that can enable us access, modify the information in a contextual manner.
Databases are logically modeled storage spaces for all kinds of different information (data). Each database, other than schema-less ones, have a model which provides structure for the data being dealt with. Database management systems are applications (or libraries) which manage databases of various shapes, sizes, and sorts.
MySQL is an open source relational database management system that runs as a server providing multi-user access to a number of databases. It is named after co-founder Michael Widenius' daughter, My. The SQL phrase stands for Structured Query Language. 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. 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. 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.
PostgreSQL, often simply Postgres, is an object-relational database management system (ORDBMS) available for many platforms including Linux, FreeBSD, Solaris, Microsoft Windows and Mac OS X. It is released under the PostgreSQL License, which is an MIT-style license, and is thus free and open source software. PostgreSQL is developed by the PostgreSQL Global Development Group, consisting of a handful of volunteers employed and supervised by companies such as Red Hat and Enterprise DB. It implements the majority of the SQL:2008 standard, is ACID-compliant, is fully transactional (including all DDL statements), has extensible data types, operators, index methods, functions, aggregates, procedural languages, and has a large number of extensions written by third parties.
SQL Server is Microsoft's relational database management system (RDBMS). It is a full-featured database primarily designed to compete against competitors Oracle Database (DB) and MySQL. Like all major RBDMS, SQL Server supports ANSI SQL, the standard SQL language.
SQL Server is offered in several editions with different feature set and pricing options to meet a variety of user needs, including the following:
Enterprise: Designed for large enterprises with complex data requirements, data warehousing and Web-enabled databases. Has all the features of SQL Server, and its license pricing is the most expensive.
Standard: Targeted toward small and medium organizations. Also supports e-commerce and data warehousing.
Workgroup: For small organizations. No size or user limits and may be used as the backend database for small Web servers or branch offices.
Express: Free for distribution. Has the fewest number of features and limits database size and users. May be used as a replacement for an Access database.
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