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Oracle Advanced PL/SQL Developer Professional Guide by Saurabh Gupta

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Chapter 1. Overview of PL/SQL Programming Concepts

In the summer of 1970, Dr. E.F. Codd published his paper, A Relational Model of Data for Large Shared Data Banks, for the ACM journal. The projected model was accepted and subsequently an interactive database language, SQL, was developed by IBM Corporation, Inc. In 1979, Relational Software, Inc. stepped into the commercial implementation of SQL as the primary RDBMS language. Later, Relational Software, Inc. transformed into Oracle and since then, its story has been a success.

The Structured Query Language or SQL (pronounced "Sequel") has been used as the primary interactive language for all data operations such as selection, creation, and manipulation. Besides data operations, the language has ...

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