third normal form การใช้

• The DW database in a hybrid solution is kept on third normal form to eliminate data redundancy.
• The Relational model and notion of Third normal form were the de facto standard for all data storage.
• Informally, a relational database table is often described as " normalized " if it meets Third Normal Form.
• This modeling style is a hybrid design, consisting of the best practices from both third normal form and star schema.
• In database normalization, one of the important features of third normal form is that it excludes certain types of transitive dependencies.
• For example, all the relations are in third normal form and any relations with join and multi-valued dependencies are handled appropriately.
• E . F . Codd, the inventor of the relational model, introduced the concepts of transitive dependence and third normal form in 1971.
• The third normal form, Boyce Codd normal form, fourth normal form and fifth normal form are special cases of the domain / key normal form.
• The Data Vault model is not a true third normal form, and breaks some of its rules, but it is a top-down architecture with a bottom up design.
• "' Elementary Key Normal Form "'( EKNF ) is a subtle enhancement on 3NF . By definition, EKNF tables are also in third normal form ( 3NF ).
• Codd went on to define the Second normal form ( 2NF ) and Third normal form ( 3NF ) in 1971, and Codd and Raymond F . Boyce defined the Boyce-Codd Normal Form ( BCNF ) in 1974.
• The normalized approach, also called the 3NF model ( Third Normal Form ) refers to Bill Inmon's approach in which it is stated that the data warehouse should be modeled using an E-R model / normalized model.
• Consequently, the arguments about EAV vs . " relational " design reflect incomplete understanding of the problem : An EAV design should be employed only for that sub-schema of a database where sparse attributes need to be modeled : even here, they need to be supported by third normal form metadata tables.