Which of the following correctly defines a relationship in which each record of one table is represented by only one record of data in the other table and vice versa?

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Question restatement: The prompt asks for the relationship type where each record in one table corresponds to exactly one record in the other table, and vice versa.
Option 1: one-to-one. This matches the standard database relationship where both sides have a unique correspondence; each row in table A relates to a single row in table B and each row in table B relates to a single row in table A. This is the textbook definition of a one-to-one relationship.
Option 2: many-to-many. In this case, records on the left can relate to multiple records on the right and vice versa, which clearly violates the constraint of “each record in one table is represented by only one record in the other table and vice versa.” This option describes a more complex linkage that requires a junction table to implement.
Option 3: one-to-many. Here, a single record in the first table can be associated with multiple records in the second table, but not the reverse; that is, the relationship goes from one to many, not one-to-one. This does not satisfy the requirement that each record in the second table maps to only one in the first.
Option 4: many-to-none. This phrasing is non-standard for relational schemas and conceptually suggests no valid or restricted mapping between tables; it contradicts the idea of a defined single-record correspondence and is not used to describe common relational cardinalities.
In summary, the core criterion is the strict one-to-one correspondence between records in both tables, which is uniquely satisfied by the one-to-one relationship.

BU.330.770.T2.FA25 Quiz 1- Requires Respondus LockDown Browser

Which of the following correctly defines a relationship in which each record of one table is represented by only one record of data in the other table and vice versa?

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