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SQL training is offered as non-degree, continuing education courses or as part of the curricula in computer related degree programs, such as computer science, engineering, programming and information technology.
Originally based upon relational algebra and tuple relational calculus, SQL consists of many types of statements, which may be informally classed as sublanguages, commonly: a data query language (DQL), a data definition language (DDL), a data control language (DCL), and a data manipulation language (DML).