Concepts inOptimizing cursor movement in holistic twig joins
Join (SQL)
A SQL join clause combines records from two or more tables in a database. It creates a set that can be saved as a table or used as is. A is a means for combining fields from two tables by using values common to each. ANSI standard SQL specifies four types of :,,, and . As a special case, a table (base table, view, or joined table) can to itself in a self-join. A programmer writes a predicate to identify the records for joining.
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XQuery
XQuery is a query and functional programming language that is designed to query collections of XML data. XQuery 1.0 was developed by the XML Query working group of the W3C. The work was closely coordinated with the development of XSLT 2.0 by the XSL Working Group; the two groups shared responsibility for XPath 2.0, which is a subset of XQuery 1.0. XQuery 1.0 became a W3C Recommendation on January 23, 2007 .
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Inverted index
In computer science, an inverted index (also referred to as postings file or inverted file) is an index data structure storing a mapping from content, such as words or numbers, to its locations in a database file, or in a document or a set of documents. The purpose of an inverted index is to allow fast full text searches, at a cost of increased processing when a document is added to the database. The inverted file may be the database file itself, rather than its index.
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Input/output
In computing, input/output, or I/O, refers to the communication between an information processing system (such as a computer), and the outside world, possibly a human, or another information processing system. Inputs are the signals or data received by the system, and outputs are the signals or data sent from it. The term can also be used as part of an action; to "perform I/O" is to perform an input or output operation.
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XML
{{stack| {{Infobox file format | icon = | logo = | screenshot = | extension = . xml | mime = application/xml, (deprecated in an expired draft) and end with a, or begin with the character and end with a . Strings of characters which are not markup are content. Tag A markup construct that begins with and ends with .
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