Database model - Wikipedia
A database model is a type of data model that determines the logical structure of a database. It fundamentally determines in which manner data can be stored, organized and manipulated. The most popular example of a database model is the relational model , which uses a …
Category:Database models - Wikipedia
Pages in category "Database models" The following 14 pages are in this category, out of 14 total. This list may not reflect recent changes.
Database design - Wikipedia
Database design is the organization of data according to a database model. The designer determines what data must be stored and how the data elements interrelate. With this information, they can begin to fit the data to the database model. [1] A database management system manages the data accordingly.
Database theory - Wikipedia
Database theory encapsulates a broad range of topics related to the study and research of the theoretical realm of databases and database management systems.
Hierarchical database model - Wikipedia
A hierarchical database model is a data model in which the data is organized into a tree-like structure.The data are stored as records which is a collection of one or more fields.Each field contains a single value, and the collection of fields in a record defines its type.One type of field is the link, which connects a given record to associated records.
Database schema - Wikipedia
The term "schema" refers to the organization of data as a blueprint of how the database is constructed (divided into database tables in the case of relational databases). The formal definition of a database schema is a set of formulas (sentences) called integrity constraints imposed on a database.
Data modeling - Wikipedia
The data modeling process. The figure illustrates the way data models are developed and used today . A conceptual data model is developed based on the data requirements for the application that is being developed, perhaps in the context of an activity model.The data model will normally consist of entity types, attributes, relationships, integrity rules, and the definitions of those objects.
Relational model - Wikipedia
The relational model (RM) is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by English computer scientist Edgar F. Codd, [1] [2] where all data are represented in terms of tuples, grouped into relations.
Conceptual schema - Wikipedia
A conceptual schema or conceptual data model is a high-level description of informational needs underlying the design of a database. [ 1 ] [ 2 ] It typically includes only the core concepts and the main relationships among them.
Codd's 12 rules - Wikipedia
Codd's twelve rules [1] 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 considered relational, i.e., a relational database management system (RDBMS).