Chapter 1. SQL and Data

What is SQL? SQL (pronounced sequel) is an acronym for Structured English QUEry Language, a standardized language used to access and manipulate data. The history of SQL corresponds closely with the development of relational databases concepts published in a paper by Dr. E. F. Codd at IBM in 1970. He applied mathematical concepts to the specification of a method for data storage and access; this specification, which became the basis for relational databases, was intended to overcome the physical dependencies of the then-available database systems. The SQL language (originally called ...

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