An Artificial Column Added to a Relation to Serve as the Primary

question 28

Multiple Choice

An artificial column added to a relation to serve as the primary key is a ________.

• A)composite key
• B)candidate key
• C)foreign key
• D)surrogate key
• E)dependency

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Definitions:

Rh Positive

Rh Positive refers to the presence of the Rh(D) antigen on the surface of red blood cells, a key factor in determining the compatibility of blood types.

Rh Negative

A blood type classification indicating the absence of the Rh (Rhesus) antigen on the surface of red blood cells.

Anti-Rh Antibodies

Immune system proteins that target the Rh factor, potentially causing complications in Rh-incompatible blood transfusions or pregnancies.

Rh-positive

Refers to the presence of the Rh factor on the surface of red blood cells, a common blood group antigen.