How many kinds of databases are there? What are the common companies?

How many problems have been solved and reproduced in QQ spatial database? 5 [Label: Database] Information λ Answer: 1 Popularity: 1 1 Solution time: May 25, 200910: 45 Satisfied answer 65438. IBM completed the prototype of System R in 1977, and began to provide integrated database server-System/38 in 1980, followed by SQL/DSforVSE and VM. Its initial version is closely related to the research prototype of system R .. DB2 forMVSV 1 was introduced in 1983. The goal of this version is to provide the simplicity, data independence and user productivity promised by this new scheme. DB2 for MVS provides powerful online transaction processing (OLTP) support in 1988, and implements distributed database support in 1989 and 1993 respectively. The recently launched DB2 Universal Database 6. 1 is a model of Universal Database, the first multimedia relational database management system with online function, and supports a series of platforms including Linux. 2. Oracle Bone Inscriptions Oracle Bone Inscriptions, formerly known as SDL, was founded by Larry Ellision and two other programmers in 1977. They developed their own fist products and sold them in the market. 1979, Oracle launched the first commercial SQL relational database management system. Oracle Company is one of the earliest manufacturers to develop relational databases, and its products support the most extensive operating system platforms. At present, the market share of Oracle relational database products is among the best. 3.Informix Informix was founded in 1980 to provide professional relational database products for Unix and other open operating systems. The company name Informix is taken from the combination of Information and Unix. Informix's first relational database product that really supported SQL language was Informix SE(StandardEngine). InformixSE was the main database product under the microcomputer Unix environment at that time. It is also the first commercial database product transplanted to Linux. 4.Sybase Sybase was founded in 1984. The company name "Sybase" comes from the combination of "system" and "database". Bob Epstein, one of the founders of Sybase Company, is the main designer of Ingres University Edition (a relational database model product at the same time as System/R). The first relational database product of this company is Sybase SQLServer 1.0, which was launched in May 1987. Sybase first put forward the idea of client/server database architecture, and took the lead in implementing it in Sybase SQLServer. 5.SQL Server 1987, Microsoft and IBM jointly developed OS/2, and IBM bundled OS/2Database Manager in its OS/2 ExtendedEdition system, but Microsoft's product line still lacks database products. Therefore, Microsoft turned its attention to Sybase and signed a cooperation agreement with Sybase to develop a relational database based on OS/2 platform by using Sybase technology. 1989, Microsoft released the 1.0 version of SQL Server. 6.PostgreSQL PostgreSQL is a relational database management system (ORDBMS), which is an object of free software and has complete characteristics. Many of its features are the predecessors of many commercial databases today. PostgreSQL originally started with the Ingres project of BSD. The features of PostgreSQL cover SQL-2/SQL-92 and SQL-3. First of all, it contains the support of the richest data types in the world. Secondly, PostgreSQL is the only free software database management system that supports transaction, sub-query, multi-version parallel control system and data integrity check. 7.mySQL mySQL is a small relational database management system, developed by Swedish MySQL AB company. It was acquired by Sun Company on June 65438+ 10/6, 2008. At present, MySQL is widely used in small and medium-sized websites on the Internet. Because of its small size, high speed and low total cost of ownership, especially open source, many small and medium-sized websites choose MySQL as the website database to reduce the total cost of ownership.