Query language

This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Query language" – news · newspapers · books · scholar · JSTOR (October 2010) (Learn how and when to remove this template message) This article lacks an overview of its topic. You can help by writing the lead section. (April 2018) (Learn how and when to remove this template message)

A query language, also known as data query language or database query language (DQL), is a computer language used to make queries in databases and information systems. In database systems, query languages rely on strict theory to retrieve information.^[1] A well known example is the Structured Query Language (SQL).