SQL software has various implementations, with some being open source and others proprietary. ANSI defines standard SQL, but variations exist. Common implementations include Postgres, DB2, Informix, Transact-SQL, MySQL, and Oracle.
Different types of SQL (Structured Query Language) software have been developed for various reasons. SQL is open source software, which means that its development and use are controlled by a global, often voluntary group of developers. Other groups can modify the software to better perform tasks or perform actions specific to their needs. SQL is a non-procedural language, which means that the user specifies the desired result and the software handles the necessary procedures to supply the information. The user benefits from ease of use; however, results may vary slightly between implementations.
Standard SQL is defined by the American National Standards Institute (ANSI). ANSI’s mission is to improve the productivity and competitiveness of the United States. Try to provide a common reference for SQL software. ANSI periodically reviews and publishes accepted language updates.
Due to the many versions of SQL software, some industry experts believe that there is no standard. Programmers often have to refer to variation tables when writing software that will be used on multiple platforms. The following is a list of common implementations of SQL software.
Postgre SQL, also known as Postgres, was written to support its authors database software, called Ingres. This version strives to be compatible with standard SQL software. It is compatible with virtually all major enterprise-grade operating systems. Many features are implemented to improve support for very large companies.
DB2 is IBM’s offering of SQL. It is designed for mixed workloads on distributed systems, allowing multiple users on various hardware platforms to work together. It supports Linux, Unix and Windows and has added support for z/OS. Informix is IBM’s solution for online transactional processing. Microsoft uses a proprietary version called Transact-SQL as the primary query language for their relational database management system (RDBMS).
MySQL is an open source implementation of SQL software designed for multi-user access to numerous databases. It is often bundled with other free software or servers that host websites for small businesses and individuals. These servers often use the coordinated system of the Linux operating system, Apache server, MySQL database and PHP scripting language (LAMP).
Oracle is the general term for Oracle Company RDBMS. It was the first commercial implementation of SQL software and has remained very popular. The software generally complies with the SQL standard. Oracle supports a number of platforms, including Windows, Linux, Mac OS X and Sun Solaris.
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