An attribute or combination of attributes in one table whose values must either match the primary key in another table or be null is called __________

Options
- Secondary Key
- Super key
- Candidate Key
- Foreign Key

CORRECT ANSWER : Foreign Key

Discussion Board
DBMS

09931635216

Vimal Das 01-8-2018 12:48 AM

Foreign key

An attribute or combination of attributes in one table whose values must either match the primary key in another table or be null is called Foreign Key. A foreign key is a column (or columns) that references a column (most often the primary key) of another table. The purpose of the foreign key is to ensure referential integrity of the data. In other words, only values that are supposed to appear in the database are permitted.

Prajakta Pandit 03-15-2017 03:32 AM

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