Author: Pablo

SQL (pronounced “ess-que-el”) stands for Structured Query Language. SQL is used to communicate with a database. According to ANSI (American National Standards Institute), it is the standard language for relational database management systems.

Chamberlin is probably best known as inventor of SQL (Structured Query Language), the world’s most widely used database language. Developed in by Chamberlin and Raymond Boyce, SQL was the first commercially successful language for relational databases. SQL (Structured Query Language) is a standard interactive and programming language for getting information from and updating a database. Although SQL is both an ANSI and an ISO standard, many database products support SQL with proprietary extensions to the standard language.

This language was developed at IBM by Donald D. Chamberlain in the decade of the 70’s. Initially was called SEQUEL but the name had to be change caused it was the trademark for an UK aircraft company. Donald Chamberlin and Raymond Boyce started developing this language to manipulate and retrieve data already store in IBM database system, called System R, which a group of IBM in San Jose Research Laboratory had developed before. They initially planned to sell SEQUEL to CIA and the NAVY. This language was commercial in 1981.

The Elements of SQL are clauses, expressions (scalar values, tables, columns), predicates (based on the three value logic 3VL;True, false, unknow), statements and queries (the initial and main function; retrieve data based on specific criteria).