relational language

relational language

(language)Any kind of programming language that specifiesoutput in terms of some property and some arguments. Forexample, if Tom has two brothers, Dick and Harry, a relationallanguage 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 uniqueoutput for each predicate/argument pair. Prolog is thebest known relational language.