Query language

Query languages are computer languages used to make queries into databases and information systems.

Broadly, query languages can be classified according to whether they are database query languages or information retrieval query languages. Examples include:

SQL is a well known query language for relational databases;
MDX is a query language for OLAP databases;
DMX is a query language for Data Mining models;
Datalog is a query language for deductive databases;
XQuery, XPointer and XPath are query languages for XML data sources;
SuprTool is a proprietary query language for SuprTool, a database access program used for accessing data in Image/SQL (TurboIMAGE) and Oracle databases;
MQL is a cheminformatics query language for a substructure search allowing beside nominal properties also numerical properties
SMARTS is the cheminformatics standard for a substructure search
SPARQL is a query language for RDF graphs;
CODASYL;
QUEL is a relational database access language, similar in most ways to SQL;
OQL is Object Query Language.
Poliqarp Query Language is a special query language designed to analyze annotated text. Used in the Poliqarp search engine.
OPath, intended for use in querying WinFS Stores.

[edit] See also

Topics in database management systems (DBMS) ( view • talk • edit )
Concepts Database • Database model • Relational database • Relational model • Relational algebra • Primary key, Foreign key, Surrogate key, Superkey, Candidate key • Database normalization • Referential integrity • Relational DBMS • Distributed DBMS • ACID
Objects Trigger • View • Table • Cursor • Log • Transaction • Index • Stored procedure • Partition	Topics in SQL Select • Insert • Update • Merge • Delete • Join • Union • Create • Drop
Implementations of database management systems
Types of implementations Relational • Flat file • Deductive • Dimensional • Hierarchical • Object oriented • Temporal • XML data stores	Components Query language • Query optimizer • Query plan • ODBC • JDBC
Database products
Apache Derby • Berkeley DB • Caché • DB2 • db4o • DBase • eXtremeDB • Filemaker Pro • Firebird • Greenplum • H2 • Hsqldb • Helix • Informix • Ingres • InterBase • Linter • Microsoft Access • Microsoft SQL Server • Mimer SQL • MonetDB • MySQL • Objectivity/DB • OpenLink Virtuoso • OpenOffice.org Base • Oracle • Oracle Rdb • Paradox • Perst • PostgreSQL • SQLite • Sybase IQ • Sybase • Teradata • UniVerse • Visual FoxPro Other: Object-oriented (comparison) • relational (comparison)