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Working with SQL

We spent the last section discussing some of the key concepts concerned with relational databases and communicating with them. SQL is the standard language for communicating with relational databases. SQL provides us with a programming language that we use to select, insert, update, and delete information from a relational database.

The SQL language was developed by IBM researchers as part of a project to develop a prototype relational database based on the relational database model described by E.F. Codd. The new language—SEQEL (Structured English Query Language)—was first described in a 1976 article of the IBM Journal of R&D. The name was later changed to SQL. In 1978, IBM released System R, based on Codd’s relational database model. IBM came to market with a product named System/R in 1978. In 1979, Oracle Corporation introduced the first commercially available implementation of SQL.


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