SQL has much to do with a researcher at IBM, Edgar F. (Ted) Codd, an Oxford-trained mathematician, who researched what was termed "the relational model" for data representation.
SQL, the standard that was later developed from Codd's work, provides a means of describing data with its
natural structure only - that is, without superimposing any additional structure for machine representation purposes.
This means that SQL provides data independence from hardware and storage implementation, together with a high level, nonprocedural language for accessing and
querying data.
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http://wiki.answers.com/Q/Why_sql_is_called_structured_query_language#ixzz2kxHP0iV6 自然语言的相似的结构
