Relational language

<language> Any kind of programming language that specifies output in terms of some property and some arguments.

For example, if Tom has two brothers, Dick and Harry, a relational language will respond to the query "Who is Tom's brother?" with either Dick or Harry.

Notice that unlike functional languages, relational languages do not require a unique output for each predicate/argument pair.

Prolog is the best known relational language.

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relational calculus relational database relational database management system relational data model relational DBMS	declarative language REGTRAL relational language rl Ruby	relational model RELATIVE relatively prime relative pathname Relative Record Data Set