Codd's 12 rules

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• Codd's 12 rules — Codd s twelve rules are a set of thirteen rules (numbered zero to twelve) proposed by Edgar F. Codd, a pioneer of the relational model for databases, designed to define what is required from a database management system in order for it to be… …   Wikipedia

• Codd's cellular automaton — A simple configuration in Codd s cellular automaton. Signals pass along wire made of cells in state 1 (blue) sheathed by cells in state 2 (red). Two signal trains circulate around a loop and are duplicated at a T junction onto an open ended… …   Wikipedia

• Edgar F. Codd — Infobox Scientist name = Edgar Frank Ted Codd image width = 150px caption = birth date = birth date|1923|8|23|mf=y birth place = Isle of Portland, England death date = death date and age|2003|4|18|1923|8|23|mf=y death place = Williams Island,… …   Wikipedia

• Boyce-Codd normal form — (or BCNF) is a normal form used in database normalization. It is a slightly stronger version of the third normal form (3NF). A table is in Boyce Codd normal form if and only if, for every one of its non trivial functional dependencies X → Y , X… …   Wikipedia

• Forma normal de Boyce-Codd — Saltar a navegación, búsqueda La Forma Normal de Boyce Codd (o FNBC) es una forma normal utilizada en la normalización de bases de datos. Es una versión ligeramente más fuerte de la Tercera forma normal (3FN). La forma normal de Boyce Codd… …   Wikipedia Español

• Deirdre Codd — Personal information Irish name Deirdre Níc Óda Sport Camogie …   Wikipedia

• Null (SQL) — The Greek lowercase omega (ω) character is used to represent Null in database theory. Null is a special marker used in Structured Query Language (SQL) to indicate that a data value does not exist in the database. Introduced by the creator of the… …   Wikipedia

• SQL — 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 …   Wikipedia

• Relational database management system — A Relational database management system (RDBMS) is a database management system (DBMS) that is based on the relational model as introduced by E. F. Codd. Most popular commercial and open source databases currently in use are based on the… …   Wikipedia

• First normal form — (1NF or Minimal Form) is a normal form used in database normalization. A relational database table that adheres to 1NF is one that meets a certain minimum set of criteria. These criteria are basically concerned with ensuring that the table is a… …   Wikipedia