entity+integrity

См. также в других словарях:

• Entity integrity — In the relational data model, entity integrity is one of the three inherent integrity rules. Entity integrity is an integrity rule which states that every table must have a primary key and that the column or columns chosen to be the primary key… …   Wikipedia

• Integrity constraints — are used to ensure accuracy and consistency of data in a relational database. Data integrity is handled in a relational database through the concept of referential integrity. There are many types of integrity constraints that play a role in… …   Wikipedia

• Entity-attribute-value model — (EAV), also known as object attribute value model and open schema is a data model that is used in circumstances where the number of attributes (properties, parameters) that can be used to describe a thing (an entity or object ) is potentially… …   Wikipedia

• Entity–attribute–value model — (EAV) is a data model to describe entities where the number of attributes (properties, parameters) that can be used to describe them is potentially vast, but the number that will actually apply to a given entity is relatively modest. In… …   Wikipedia

• Entity-Level Controls — Accountancy Key concepts Accountant · Accounting period · Bookkeeping · Cash and accrual basis · Cash flow management · Chart of accounts  …   Wikipedia

• Data integrity — in its broadest meaning refers to the trustworthiness of system resources over their entire life cycle. In more analytic terms, it is the representational faithfulness of information to the true state of the object that the information represents …   Wikipedia

• Referential integrity — in a relational database is consistency between coupled tables. Referential integrity is usually enforced by the combination of a primary key or candidate key (alternate key) and a foreign key. For referential integrity to hold, any field in a… …   Wikipedia

• Database integrity — ensures that data entered into the database is accurate, valid, and consistent. Any applicable integrity constraints and data validation rules must be satisfied before permitting a change to the database. Three basic types of database integrity… …   Wikipedia

• Council of Inspectors General on Integrity and Efficiency — Abbreviation CIGIE Headquarters Virtual …   Wikipedia

• Center for Public Integrity — Infobox Non profit Non profit name = The Center for Public Integrity Non profit Non profit type = 501(c)(3) founded date = March 1989 founder = Charles Lewis location = Washington DC origins = key people = Bill Buzenberg, Executive Director… …   Wikipedia

• Weak entity — In a relational database, a Weak Entity is an entity that cannot be uniquely identified by its attributes alone; therefore, it must use a foreign key in conjunction with its attributes to create a primary key. The foreign key is typically a… …   Wikipedia