Which constraint ensures a unique value in the ID column for each customer?

Posted by: Pdfprep Category: 98-364 Tags: MTA, 98-364 exam questions, 98-364 practice exam Post Date: October 25, 2020

Which constraint ensures a unique value in the ID column for each customer?
A . DISTINCT
B . FOREIGN KEY
C . SEQUENTIAL
D . PRIMARY KEY

Answer: D