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.
Multidimensional Expressions is a Microsoft-owned query language for OLAP databases.
Datalog is a query language for deductive databases.
XQuery is a query language 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.