- primary or candidate key
- первичный ключ или ключ-кандидат
English-Russian SQL Server dictionary. 2013.
primary or candidate key
Смотреть что такое "primary or candidate key" в других словарях:
Candidate key — In the relational model, a candidate key of a relvar (relation variable) is a set of attributes of that relvar such that # at all times it holds in the relation assigned to that variable that there are no two distinct tuples with the same values… … Wikipedia
Primary Key — Ein Schlüssel dient in einer Relationalen Datenbank dazu, die Tupel einer Relation eindeutig zu identifizieren. Anschaulich kann man sich eine Relation als Tabelle vorstellen. Ein Schlüssel für eine solche Tabelle ist dann eine Gruppe von Spalten … Deutsch Wikipedia
Primary key — Ein Schlüssel dient in einer Relationalen Datenbank dazu, die Tupel einer Relation eindeutig zu identifizieren. Anschaulich kann man sich eine Relation als Tabelle vorstellen. Ein Schlüssel für eine solche Tabelle ist dann eine Gruppe von Spalten … Deutsch Wikipedia
primary — pri·ma·ry 1 / prī ˌmer ē, mə rē/ adj 1: of first rank, value, or importance 2: belonging to the first group or order in successive divisions, combinations, or ramifications pri·mar·i·ly /prī mer ə lē/ adv primary 2 n pl … Law dictionary
Unique key — In relational database design, a unique key can uniquely identify each row in a table, and is closely related to the Superkey concept. A unique key comprises a single column or a set of columns. No two distinct rows in a table can have the same… … Wikipedia
Foreign key — In the context of relational databases, a foreign key is a referential constraint between two tables. [ [http://www.visualcase.com/kbase/database basics foreign keys.htm For a simpler visualization, see VisualCase.com] ] The foreign key… … Wikipedia
Surrogate key — A surrogate key in a database is a unique identifier for either an entity in the modeled world or an object in the database. The surrogate key is not derived from application data. Definition Two definitions of a surrogate appear in the… … Wikipedia
Oklahoma Republican primary, 2008 — 2000 ← February 5, 2008 (2008 02 05) … Wikipedia
Alternate key — You may have meant the Alt key on the keyboard. An alternate key (or secondary key) is any candidate key which is not selected to be the primary key (PK).For example, a relational database with a table employee could have attributes like employee … Wikipedia
Compound key — In database design, a compound key is a key that consists of 2 or more attributes that uniquely identify an entity occurrence. Each attribute that makes up the compound key is a simple key in its own right. This is often confused with a composite … Wikipedia
Natural key — In relational model database design, a natural key is a candidate key that has a logical relationship to the attributes within that row. A natural key is sometimes called a domain key. The main advantage of a natural key over a surrogate key,… … Wikipedia
