DATALOG is a historical programming language created in 1977. Datalog is a declarative logic programming language that syntactically is a subset of Prolog. It is often used as a query language for deductive databases. In recent years, Datalog has found new application in data integration, information extraction, networking, program analysis, security, and cloud computing. Read more on Wikipedia...

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Example code from Wikipedia:

ancestor(X,Y) :- parent(X,Y).
 ancestor(X,Y) :- parent(X,Z),ancestor(Z,Y).

Last updated October 14th, 2019