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a database language specifies the semantics of various components of a DBMS: structures and operation of a data model, data definition, data access, security, programming language interface, and data administration
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Industry accepted Standard, first introduced by ANSI in 1986, current SQL92 by ANSI and ISO, new standard SQL3 with enhancements in object-oriented data management is undergoing. Portable to all RDBMS systems.
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built on relational model, simple and powerful
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non-procedural 4GL language, only specify "what-to-do", not "how-to-do" , extended to object-oriented programming interface
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this extended model competes with fledging object-oriented database in industry
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