Database query language
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Database query languages are like programming languages. The person formulating the query is expected to understand the relevant rules for formulating the query, and to program the query according to the requirements.
Their preciseness can be contrasted with the processing of an Information retrieval query language.
Examples are the CODASYL database language, "network" databases, relational algebra, relational calculus, SQL3, QUEL, XPointer, XPath and OQL.