Created by: paul01234
Number of Blossarys: 51
English (EN) A set of attributes in a referencing relation. The value of the foreign key attributes are sure to occur as the primary key value of a row or tuple in the referenced relation or table.
This refers to the collection of information stored in the database at a specific time or moment. A new instance is created when information is inserted, deleted, or updated in the database.
It is an attribute used to sort and identify data in the database. Types of database keys are primary keys, candidate keys, and foreign keys.
The process of generating a set of relation schemas that allows the storage of information without unnecessary redundancy while still allowing the easy retrieval of information.
A superkey which has a set of attributes whose values ensure the unique identification of the rows in a table. It is the principal means of identifying tuples in a relation. Its value is never, or at ...
The primary means for retrieving information from a database. This consists of questions given to the database in predefined format. A large number of database management systems use the standard ...
A database concept which guarantees that the relationships between the tables in a database remain consistent. This also ensures that a relation for a given set of attributes can also be found in a ...
