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
relational language
relational model
relatively prime
relative pathname
Relative Record Data Set