join query
21QBE — Query by Example (Suche anhand von Beispielen) bezeichnet ursprünglich eine relationale Datenbankabfragesprache, die von Moshé M. Zloof bei IBM parallel zu System R entwickelt wurde. Sie beruht im wesentlichen auf dem Bereichskalkül. Dabei wird… …
22Interrogation par l'exemple — Query By Example Query By Example ou QBE, c est à dire « interrogation par l exemple », est un langage de requête concurrent à SQL, destiné aux bases de données relationnelles. Sommaire 1 Particularités 2 Exemple 2.1 Requête QBE …
23Relational algebra — Not to be confused with Relation algebra. Relational algebra, an offshoot of first order logic (and of algebra of sets), deals with a set of finitary relations (see also relation (database)) that is closed under certain operators. These operators …
24Decomposition method (constraint satisfaction) — In constraint satisfaction, a decomposition method translates a constraint satisfaction problem into another constraint satisfaction problem that is binary and acyclic. Decomposition methods work by grouping variables into sets, and solving a… …
25SQL — This article is about the database language. For the airport with IATA code SQL, see San Carlos Airport. SQL Paradigm(s) Multi paradigm Appeared in 1974 Designed by Donald D. Chamberlin Raymond F. Boyce Developer …
26Relational database — A visual diagram showing the relationship between the two tables, as indicated by the arrow A relational database matches data by using common characteristics found within the data set. The resulting groups of data uses the relational model (a… …
27Snowflake schema — A snowflake schema is a logical arrangement of tables in a relational database such that the entity relationship diagram resembles a snowflake in shape. Closely related to the star schema, the snowflake schema is represented by centralized fact… …
28Content Management Interoperability Services — CMIS Type of format Enterprise Content Management Extended from SOAP Content Management Interoperability Services (CMIS) is a specification for improving interoperability between Enterprise Content Management systems. OASIS, a web standards… …
29Database normalization — In the design of a relational database management system (RDBMS), the process of organizing data to minimize redundancy is called normalization. The goal of database normalization is to decompose relations with anomalies in order to produce… …
30View (database) — In database theory, a view consists of a stored query accessible as a virtual table in a relational database or a set of documents in a document oriented database composed of the result set of a query or map and reduce functions. Unlike ordinary… …
