Datalog - Programming language

Datalog is a programming language created in 1977.

#399on PLDB

47Years Old

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...

Tags: programming language
Early development of Datalog happened in University of Maryland
Explore Datalog snippets on Rosetta Code
Datalog on HOPL
See also: (15 related languages) Prolog, Java, OWL, C, Python, Ruby, Lua, Clojure, Racket, Tcl, Haskell, .QL, RDF, SPARQL, Datomic
Read more about Datalog on the web: 1. 2. 3.
2 PLDB concepts link to Datalog: Datomic, Yedalog

Example from the web:

parent(john, douglas). % store some data
parent(john, douglas)? % run a query

Example from Wikipedia:

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

Language features

Feature	Supported	Example	Token
Comments	✓	% A comment
Line Comments	✓	% A comment	%
Semantic Indentation	X