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Database index. A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes and storage space to maintain the index data structure. Indexes are used to quickly locate data without having to search every row in a database table every time said table is accessed.
Yahoo! Query Language. Yahoo! Query Language ( YQL) is an SQL -like query language created by Yahoo! as part of their Developer Network. YQL is designed to retrieve and manipulate data from APIs through a single Web interface, thus allowing mashups that enable developers to create their own applications [1] using Yahoo! Pipes online tool.
Ancestry.com. For-profit genealogy company. Databases include Find a Grave, RootsWeb, a free genealogy community, and Newspapers.com. Archives.gov. US National Archives and Records Administration. Free online repository with a section dedicated to genealogical research [ 1] BALSAC. Population database of Quebec, Canada. Cyndi's List.
Rules allow the "query tree" of an incoming query to be rewritten; they are an, automatically invoked, macro language for SQL. "Query Re-Write Rules" are attached to a table/class and "Re-Write" the incoming DML (select, insert, update, and/or delete) into one or more queries that either replace the original DML statement or execute in addition ...
FreeBMD. FreeBMD is a website which coordinates and provides free transcriptions of the indexes to births, marriages and deaths (BMD) held by the General Register Office for England and Wales (GRO). It also provides a free search function and online access to images of the pages of the BMD indexes. The website was founded in 1998.
The main academic full-text databases are open archives or link-resolution services, although others operate under different models such as mirroring or hybrid publishers. Such services typically provide access to full text and full-text search, but also metadata about items for which no full text is available.
SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...
A relational database ( RDB[ 1]) is a database based on the relational model of data, as proposed by E. F. Codd in 1970. [ 2] A database management system used to maintain relational databases is a relational database management system ( RDBMS ). Many relational database systems are equipped with the option of using SQL (Structured Query ...