Foreign Key - Wikipedia. The foreign key links these two tables. Foreign key (plural foreign keys) a column (or group of columns) in a relational table that identifies another table, so that items in the two tables can be conceptually linked.
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In the context of relational databases, a foreign key is a referential constraint between two tables. Any other candidate key is an alternate key. The foreign key links these two tables. In this case the surrogate may be used as a. A foreign key is a field in a relational table that matches the primary key column of another table. Therefore, cascading relationships between tables can be established using foreign keys. Attribut constraints, beziehen sich auf eine einzelne spalte ; Foreign key → der skalar muss auf referentielle integrität geprüft werden; Bisher wurden weltweit über 80 millionen tonträger der gruppe verkauft. Sql foreign key on create table.
The foreign key links these two tables. Therefore, cascading relationships between tables can be established using foreign keys. Zu ihren populärsten hits zählen cold. Nancy is possibly the same vocalist from nancy sings on chair beside a window. Zur navigation springen zur suche springen. An important distinction between a surrogate and a primary key depends on whether the database is a current database or a temporal database. A foreign key is a set of attributes in a table that refers to the primary key of another table. Another way to put it: Des weiteren gibt es verschiedene typen von constraints: Foreign key (plural foreign keys) a column (or group of columns) in a relational table that identifies another table, so that items in the two tables can be conceptually linked. The foreign key constraint is a key used to link two tables together.
