Which one of the following statements is wrong? ( ) Alternate keys are candidate keys. ( ) Foreign key cannot have value NULL. ( ) If the foreign key value of a table neither matches any candidate key of its home relation nor is null, referential integrity of the table does not hold. ( ) A primary key may consist of all attributes of a table.

Database Systems: Design, Implementation, & Management
12th Edition
ISBN:9781305627482
Author:Carlos Coronel, Steven Morris
Publisher:Carlos Coronel, Steven Morris
Chapter3: The Relational Database Model
Section: Chapter Questions
Problem 17P: For each table, identify the primary key and the foreign key(s). If a table does not have a foreign...
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Which one of the following statements is wrong?

( ) Alternate keys are candidate keys.

( ) Foreign key cannot have value NULL.

( ) If the foreign key value of a table neither matches any candidate key of its home relation nor is null, referential integrity of the table does not hold.

( ) A primary key may consist of all attributes of a table.

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