Query languages for data that is stored as a graph of linked items rather than as tables. SPARQL is the query language for RDF data and one of the key technologies of the semantic web, Cypher is a declarative query language for property graphs that originated at Neo4j, and GraphQL lets a client ask for exactly the data it needs from one or many sources. GraphQL separates what data a client asks for from where it is stored, and SPARQL was made a standard by the RDF Data Access Working Group of the World Wide Web Consortium.
All Graph and Semantic Data Query Languages
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SPARQL - Wikipedia
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SPARQL (pronounced "sparkle", a recursive acronym for SPARQL Protocol and RDF Query Language) is an RDF query language-that is, a semantic query language for databases-able to retrieve and manipulate data stored in Resource Description Framework (RDF) format.
Cypher (query language) - Wikipedia
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Cypher is a declarative graph query language that allows for expressive and efficient data querying in a property graph.
Wikipedia: GraphQL
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GraphQL is a data query and manipulation language that allows specifying what data is to be retrieved ("declarative data fetching") or modified. A GraphQL server can process a client query using data from separate sources and present the results in a unified graph.
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