Query language

querydatabase languagedatabase query languagequeriesdata query languagequeryingData queriesgeneral queriesquerying,
Query languages or data query languages (DQLs) are computer languages used to make queries in databases and information systems.wikipedia
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Database

database management systemdatabasesdatabase systems
Query languages or data query languages (DQLs) are computer languages used to make queries in databases and information systems.
In the 2000s, non-relational databases became popular, referred to as NoSQL because they use different query languages.

Information retrieval query language

Broadly, query languages can be classified according to whether they are database query languages or information retrieval query languages.
An information retrieval (IR) query language is a query language used to make queries into search index.

Attempto Controlled English

Attempto Controlled English is a query language that is also a controlled natural language.
ACE can serve as knowledge representation, specification, and query language, and is intended for professionals who want to use formal notations and formal methods, but may not be familiar with them.

Datalog

magic sets
Datalog is a query language for deductive databases;
It is often used as a query language for deductive databases.

SQL

Structured Query LanguageSQL DatabasesWikibook SQL
FQL enables you to use a SQL-style interface to query the data exposed by the Graph API. It provides advanced features not available in the Graph API. QUEL is a relational database access language, similar in most ways to SQL; SQL is a well known query language and data manipulation language for relational databases; YQL is an SQL-like query language created by Yahoo!
Originally based upon relational algebra and tuple relational calculus, SQL consists of many types of statements, which may be informally classed as sublanguages, commonly: a data query language (DQL), a data definition language (DDL), a data control language (DCL), and a data manipulation language (DML).

Facebook Query Language

FQL
FQL enables you to use a SQL-style interface to query the data exposed by the Graph API. It provides advanced features not available in the Graph API.
Facebook Query Language (FQL) is a query language that allows querying Facebook user data by using a SQL-style interface, avoiding the need to use the Facebook Platform Graph API.

GraphQL

GraphQL is a data query language developed by Facebook as an alternate to REST and ad-hoc webservice architectures.
GraphQL is an open-source data query and manipulation language for APIs, and a runtime for fulfilling queries with existing data.

OpenCog

OpenCog Foundation
Atomese, the graph query language for the OpenCog graph database, the AtomSpace.
This generalizes the idea of a structured query language (SQL) to the domain of generic graphical queries; it is an extended form of a graph query language.

Relational database

relational databasesrelationaldatabase constraints
.QL is a proprietary object-oriented query language for querying relational databases; successor of Datalog; QUEL is a relational database access language, similar in most ways to SQL; SQL is a well known query language and data manipulation language for relational databases;

Computer language

computer languageslanguagelanguages
Query languages or data query languages (DQLs) are computer languages used to make queries in databases and information systems.
Query language, a language used to make queries in databases and information systems

Language Integrated Query

LINQLINQ to SQLLanguage Integrated Query (LINQ)
LINQ query-expressions is a way to query various data sources from .NET languages
Language Integrated Query (LINQ, pronounced "link") is a Microsoft .NET Framework component that adds native data querying capabilities to .NET languages, originally released as a major part of .NET Framework 3.5 in 2007.

Contextual Query Language

CQL
Contextual Query Language (CQL) a formal language for representing queries to information retrieval systems such as web indexes or bibliographic catalogues.
Based on the semantics of Z39.50, its design objective is that queries be human readable and writable, and that the language be intuitive while maintaining the expressiveness of more complex query languages.

MultiDimensional eXpressions

MDXMultidimensional ExpressionOLAP: Multidimensional Expressions
MDX is a query language for OLAP databases;
Multidimensional Expressions (MDX) is a query language for online analytical processing (OLAP) using a database management system.

Object Query Language

OQL
OQL is Object Query Language;
Object Query Language (OQL) is a query language standard for object-oriented databases modeled after SQL.

RDF query language

RDF graphs
RDQL is a RDF query language;
An RDF query language is a computer language, specifically a query language for databases, able to retrieve and manipulate data stored in Resource Description Framework (RDF) format.

QUEL query languages

QUELIngres QUELPOSTQUEL query language
QUEL is a relational database access language, similar in most ways to SQL;
QUEL is a relational database query language, based on tuple relational calculus, with some similarities to SQL.

Molecular Query Language

MQL
MQL is a cheminformatics query language for a substructure search allowing beside nominal properties also numerical properties;
The query language is based on an extended Backus–Naur form (EBNF) using JavaCC.

Big data

big data analyticsbig-databig data analysis
SPL is a search language for machine-generated big data, based upon Unix Piping and SQL.
Big data challenges include capturing data, data storage, data analysis, search, sharing, transfer, visualization, querying, updating, information privacy and data source.

SPARQL

RDF Data Access
SPARQL is a query language for RDF graphs;
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.

WinFS

Itemnext-generation file systemWindows file systems
OPath, intended for use in querying WinFS Stores;
Indexes are also used during information search; searching and querying use the indexes to quickly complete the operations, much like desktop search systems.

XQuery

queried
XQuery is a query language for XML data sources;
XQuery (XML Query) is a query and functional programming language that queries and transforms collections of structured and unstructured data, usually in the form of XML, text and with vendor-specific extensions for other data formats (JSON, binary, etc.).

XPath

XPath axesquerying (XPath)XPath expression
XPath is a declarative language for navigating XML documents;
XPath (XML Path Language) is a query language for selecting nodes from an XML document.

Data manipulation language

DMLData Manipulation Language (DML)manipulation
SQL is a well known query language and data manipulation language for relational databases;
Read-only selecting of data is sometimes distinguished as being part of a separate data query language (DQL), but it is closely related and sometimes also considered a component of a DML; some operators may perform both selecting (reading) and writing.

Poliqarp

Poliqarp Query Language is a special query language designed to analyze annotated text. Used in the Poliqarp search engine;
Custom query language

Yahoo! Query Language

YQL
YQL is an SQL-like query language created by Yahoo!
Query Language (YQL''') is an SQL-like query language created by Yahoo! as part of their Developer Network.