In a database, a foreign key is ?
A. A data element/attribute within a data field of a data record that is not unique, and cannot be used to distinguish one data record in a database from another data record within a database table
B. A data element/attribute within a data field of a data record within a database table that is a secondary key in another database table
C. A data element/attribute within a data field of a data record within a database table that is a primary key in another database table
D. A data element/attribute within a data field of a data record that enables a database to uniquely distinguish one data record in a database from another data record within a database table
Answer:A
In a database, a foreign key is ?
A. A data element/attribute within a data field of a data record that is not unique, and cannot be used to distinguish one data record in a database from another data record within a database table B. A data element/attribute within a data field of a data record within a database table that is a secondary key in another database table C. A data element/attribute within a data field of a data record within a database table that is a primary key in another database table D. A data element/attribute within a data field of a data record that enables a database to uniquely distinguish one data record in a database from another data record within a database table