Question

Which relationship is possible when two tables share the same primary key? one-to-one one-to-many many-to-one many-to-many

Answer 1

for plato many-to-one is not the answer

Answer 2

Many-to-one relationships is possible when two tables share the same primary key it is because one entity contains values that refer to another entity that has unique values. It often enforced by primary key relationships, and the relationships typically are between fact and dimension tables and between levels in a hierarchy.