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Visualization of an R*-tree for 3D cubes using ELKI R-trees are tree data structures used for spatial access methods , i.e., for indexing multi-dimensional information such as geographical coordinates , rectangles or polygons . The R-tree was proposed by Antonin Guttman in 1984 [ 1 ] and has found significant use in both research and real-world applications. [ 2 ] A common real-world usage for an R-tree might be to store spatial objects such as restaurant locations or the polygons that typical maps are made of: streets, buildings, outlines of lakes, coastlines, etc. and then find answers quickly to queries such as "Find all museums within 2 km of my current location", "retrieve all road segments within 2 km of my location" (to display them in a navigation system ) or "find the nearest gas station" (although not taking roads into account). [ edit ] R-tree idea
R-tree - Wikipedia, the free encyclopedia
Fuzzy string searching - Wikipedia, the free encyclopedia
In computer science , approximate string matching (often colloquially referred to as fuzzy string searching ) is the technique of finding strings that match a pattern approximately (rather than exactly). The problem of approximate string matching is typically divided into two sub-problems: finding approximate substring matches inside a given string and finding dictionary strings that match the pattern approximately. [ edit ] Overview The closeness of a match is measured in terms of the number of primitive operations necessary to convert the string into an exact match. This number is called the edit distance between the string and the pattern. The usual primitive operations are: [1]
"ISO/IEC 9075-1:2008: Information technology – Database languages – SQL – Part 1: Framework (SQL/Framework)" . http://www.iso.org/iso/catalogue_detail.htm?csnumber=45498 SQL (officially / ˈ ɛ s k juː ˈ ɛ l / "S-Q-L", often / ˈ s iː k w əl / "Sequel"; [ 3 ] sometimes referred to as Structured Query Language ) is a programming language designed for managing data in relational database management systems (RDBMS).
SQL - Wikipedia, the free encyclopedia