Relational databases | Database storage | Database management systems

A computer database is a structured collection of records or data that is stored in a computer system so that a computer program or person using a query language can consult it to answer queries. The records retrieved in answer to queries are information that can be used to make decisions. The computer program used to manage and query a database is known as a database management system (DBMS).

A typical query of a database could be to answer questions such as, "How many houses with three or more rooms were sold in the month of March in Birmingham?". To answer such a question, the database would have to store information about houses sold, including number of rooms, sales date, and the region and city. The term "database" originated within the computing discipline. Although its meaning has been broadened by popular use, even to include non-electronic databases, this article is about computer databases. Database-like collections of information existed well before the Industrial Revolution in the form of written ledgers, sales receipts and other business-related collections of data

there are a number Computer database systems which include:  4D, Alpha Five, Apache Derby (Java, also known as IBM Cloudscape and Sun Java DB), BerkeleyDB, dBase, FileMaker, Firebird (database server), Hsqldb (Java), IBM DB2, Informix, Ingres, Interbase, MaxDB (formerly SapDB), Microsoft Access, Microsoft SQL Server (derived from Sybase), MySQL, Oracle Corporation, Paradox (database), PostgreSQL, Simpol, SolidDB, Superbase, Sybase, Visual FoxPro, Trackvia, CouchDb (non-relational document-based system) there are also a number of post relational databases including PICK also known as MultiValue and MUMPS

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