In an entity, an identifier is an attribute that uniquely identifies an instance of the entity. If ID is an integer attribute and is the identifier of entity X, how many times can ID 10 appear?
Once
Up to 10 times only
Never because it is the identifier
As many times as needed because it is the identifier
Numbers and figures are an essential part of our world, necessary for almost everything we do every day. As important…
APPROVED BY CLIENTS
"assignmentexpert.com" is professional group of people in Math subjects! They did assignments in very high level of mathematical modelling in the best quality. Thanks a lot
Comments
Leave a comment