How do you figure out how a table's relationship is functional?

Answer 1

To determine if a table's relationship is functional, check if each input (or key) in the table corresponds to exactly one output (or value). This can be done by ensuring that no two rows in the table have the same value for the key column. Additionally, examining the table's structure or any associated constraints (like primary keys in a database) can help confirm the functional relationship. If every input consistently leads to a unique output, the relationship is indeed functional.