Gremlin is an open source query language created in 2009 by Marko A. Rodriguez.
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Gremlin is a graph traversal language and virtual machine developed by Apache TinkerPop of the Apache Software Foundation. Gremlin works for both OLTP-based graph databases as well as OLAP-based graph processors. Gremlin's automata and functional language foundation enable Gremlin to naturally support imperative and declarative querying, host language agnosticism, user-defined domain specific languages, an extensible compiler/optimizer, single- and multi-machine execution models, hybrid depth- and breadth-first evaluation, as well as Turing Completeness. Read more on Wikipedia...
g.V().hasLabel('movie').values('year').min()g.V().match(
as("a").label().is("person"),
as("a").out("knows").as("b"),
as("a").out("created").as("c"),
as("b").out("created").as("c"),
as("b").values("age").as("d"),
as("d").is(gt(30))).
select("a","b","c")