A '''query [programming language%|%language]''' focuses on expressing criteria for the selection of a subset of structured data. ** Reference ** [https://en.wikipedia.org/wiki/Query_language%|%Wikipedia]: ** Query Languages ** [Playing ISBL%|%Information System Base Language (ISBL)]: A language, more algebraic than [SQL], for querying [relational database%|%relational data]. [LINQ]: a first-class language construct in [C#] and [Visual Basic] that can be used for querying [relational database%|%relational data], [XML] documents, ADO.NET datasets, and various [.NET] container types [MQL]: a query language for Emdros, a proprietary database engine for analyzed or annotated text. [SQL]: the de-facto standard for querying [relational database%|%relational data] [treeql]: a [Cost]-like [Tree] editing and query language [XML Query%|%XQuery]: an [XML] language for querying sets of documents. [XPath]: a language for addressing parts of an [XML] document. It is a component of [XQuery]. ** See Also ** [How to synthesize a query]: a working page for JOIN algorithms in Tcl [Bloom Filters]: [lquery], by [Richard Suchenwirth]: an interface for querying [list%|%lists] [Natively accessing XML]: [NLP for a Knowledge Database]: presentation of a bot that answered questions abouthte show ''Law & Order'' [Vlerq]: a research project for data structures; includes a query mechanism <> language