Query languages are computer languages used to make queries into databases and information systems. A Computer Database is a structured collection of records or data that is stored in a computer system The term information system (IS sometimes refers to a System of persons Data records and activities that process the data and Information in an organization

Broadly, query languages can be classified according to whether they are database query languages or information retrieval query languages. Query languages are Computer languages used to make queries into Databases and Information systems Broadly query languages can be classified An information retrieval query language is a Query language used to make queries into database where the semantics of the query are defined not by a precise rendering of a formal Examples include:

• .QL is a proprietary object-oriented query language for querying relational databases;
• Common Query Language (CQL) a formal language for representing queries to information retrieval systems such as as web indexes or bibliographic catalogues. A relational database is a Database that groups data using common attributes found in the data set Common Query Language or contextual query language (CQL is a Formal language for representing queries to Information retrieval systems such as Search Information retrieval ( IR) is the science of searching for documents for Information within documents and for metadata about documents as well as that
• CODASYL;
• D is a query language for truly relational database management systems (TRDBMS);
• DMX is a query language for Data Mining models;
• Datalog is a query language for deductive databases;
• ERROL is a query language over the Entity-relationship model (ERM), especially tailored for relational databases;
• Gellish English is a language that can be used for queries in Gellish English Databases [1], for dialogues (requests and responses) as well as for information modeling and knowledge modeling;
• ISBL is a query language for PRTV, one of the earliest relational database management systems;
• LDAP is an application protocol for querying and modifying directory services running over TCP/IP. CODASYL (often spelt Codasyl) is an Acronym for "Conference on Data Systems Languages" D is a set of requirements proposed by Christopher J Date and Hugh Darwen in their book The Third Manifesto for what they believe a Relational database A Relational database management system (RDBMS is a Database management system (DBMS that is based on the Relational model as introduced by E Data Mining Extensions (DMX is a query language for Data Mining Models much like SQL is a query language for Relational databases and MDX is Data mining is the process of Sorting through large amounts of data and picking out relevant information Datalog is a query and rule language for Deductive databases that syntactically is a subset of Prolog. A deductive database system is a Database system which can make deductions (ie conclude additional facts based on rules and Facts stored in An entity-relationship model (ERM is an abstract conceptual representation of structured data A relational database is a Database that groups data using common attributes found in the data set Gellish English is a variant of Gellish and is a Formal language, which means that it is structured and formalised subset of natural English that is computer interpretable Knowledge modeling is a process of creating a computer interpretable model of knowledge or standard specifications about a kind of process and/or about a kind of facility or product ISBL ( Information Systems Base Language) is the Relational algebra notation that was invented for PRTV, one of the earliest Database management systems PRTV ( Peterlee Relational Test Vehicle) was the world's first Relational database management system that could handle significant data volumes The Lightweight Directory Access Protocol, or LDAP (ˈɛl dæp is an Application protocol for querying and modifying Directory services running over The Application Layer is the seventh level of the seven-layer OSI model, and the top layer of the TCP/IP model In software engineering a directory is similar to a dictionary it enables the look up of a name and information associated with that name The Internet Protocol Suite (commonly TCP/IP) is the set of Communications protocols used for the Internet and other similar networks
• MQL is a cheminformatics query language for a substructure search allowing beside nominal properties also numerical properties;
• MDX is a query language for OLAP databases;
• OQL is Object Query Language;
• OCL (Object Constraint Language). The Molecular Query Language ( MQL) was designed for allowing more complex and problem specific search methods Cheminformatics (also known as chemoinformatics and chemical informatics) is the use of computer and informational techniques applied to a range of problems In complexity theory, Subgraph-Isomorphism is a Decision problem that is known to be NP-complete. Multidimensional Expressions (MDX is a Query language for OLAP Databases much like SQL is a query language for Relational databases Online Analytical Processing or OLAP (ˈoʊlæp is an approach to quickly provide answers to analytical queries that are multi-dimensional in nature Object Query Language (OQL is a Query language standard for object-oriented databases modelled after SQL. The Object Constraint Language is a Declarative language for describing rules that apply to UML models developed at IBM and now part of the UML standard Despite it's name, OCL is also an object query language and a OMG standard. Object Management Group ( OMG) is a Consortium, originally aimed at setting standards for distributed Object-oriented systems and is now focused
• OPath, intended for use in querying WinFS Stores;
• Poliqarp Query Language is a special query language designed to analyze annotated text. WinFS (short for Windows Future Storage) is the code name for a data storage and management system based on Relational databases developed by WinFS (short for Windows Future Storage) is the code name for a data storage and management system based on Relational databases developed by Used in the Poliqarp search engine;
• QUEL is a relational database access language, similar in most ways to SQL;
• SMARTS is the cheminformatics standard for a substructure search;
• SPARQL is a query language for RDF graphs;
• SQL is a well known query language for relational databases;
• SuprTool is a proprietary query language for SuprTool, a database access program used for accessing data in Image/SQL (TurboIMAGE) and Oracle databases;
• TMQL Topic Map Query Language is a query language for Topic Maps;
• XQuery is a query language for XML data sources;

Poliqarp is an Open source Search engine designed to process the Polish Corpus created at the Institute of Computer Science, Polish Academy of Sciences QUEL is a Relational database access language similar in most ways to SQL. A relational database is a Database that groups data using common attributes found in the data set Cheminformatics (also known as chemoinformatics and chemical informatics) is the use of computer and informational techniques applied to a range of problems In complexity theory, Subgraph-Isomorphism is a Decision problem that is known to be NP-complete. SPARQL (pronounced " sparkle ") is an RDF query language; its name is an Acronym that stands for S imple P rotocol The Resource Description Framework (RDF is a family of World Wide Web Consortium (W3C Specifications originally designed as a Metadata Data In Mathematics and Computer science, a graph is the basic object of study in Graph theory. A relational database is a Database that groups data using common attributes found in the data set IMAGE is the primary reason that the HP3000 was a success It is a reliable simple fast database for MPE. IMAGE is the primary reason that the HP3000 was a success It is a reliable simple fast database for MPE. Topic Maps is a standard for the representation and interchange of knowledge with an emphasis on the Findability of information XQuery is a Query language (with some Programming language features that is designed to query collections of XML data An XML database is a Data persistence software system that allows data to be stored in XML format

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