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Berkeley released POSTGRES under an MIT License variant, which enabled other developers to use the code for any use. After releasing version 4.2 on June 30, 1994 – primarily a cleanup – the project ended. By 1993, the number of users began to overwhelm the project with requests for support and features. Version 3, released in 1991, again re-wrote the rules system, and added support for multiple storage managers and an improved query engine. The team released version 1 to a small number of users in June 1989, followed by version 2 with a re-written rules system in June 1990. Starting in 1986, published papers described the basis of the system, and a prototype version was shown at the 1988 ACM SIGMOD Conference. POSTGRES used many of the ideas of Ingres, but not its code. In POSTGRES, the database understood relationships, and could retrieve information in related tables in a natural way using rules. These features included the ability to define types and to fully describe relationships – something used widely, but maintained entirely by the user. The new project, POSTGRES, aimed to add the fewest features needed to completely support data types. He won the Turing Award in 2014 for these and other projects, and techniques pioneered in them. He returned to Berkeley in 1985, and began a post-Ingres project to address the problems with contemporary database systems that had become increasingly clear during the early 1980s. In 1982, the leader of the Ingres team, Michael Stonebraker, left Berkeley to make a proprietary version of Ingres. PostgreSQL evolved from the Ingres project at the University of California, Berkeley.
PostgreSQL features transactions with Atomicity, Consistency, Isolation, Durability (ACID) properties, automatically updatable views, materialized views, triggers, foreign keys, and stored procedures. After a review in 2007, the development team decided to keep the name PostgreSQL and the alias Postgres. In 1996, the project was renamed to PostgreSQL to reflect its support for SQL. It was originally named POSTGRES, referring to its origins as a successor to the Ingres database developed at the University of California, Berkeley.
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PostgreSQL ( / ˈ p oʊ s t ɡ r ɛ s ˌ k juː ˈ ɛ l/), also known as Postgres, is a free and open-source relational database management system (RDBMS) emphasizing extensibility and SQL compliance. Linking from code with a different licence PostgreSQL License ( free and open-source, permissive)
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