What best describes a table with many-to-one mapping?

A table with many-to-one mapping is characterized by a situation where multiple values in the source column correspond to a single value in the destination column. This means that for each unique value in the destination column, there can be several entries in the source column. Understanding this concept is fundamental in database design and normalization, as it illustrates relationships between different entities.

In this case, the many-to-one relationship allows for efficient data management and querying, as it avoids redundancy and ensures that multiple occurrences can be linked back to a single category or entity. This relationship is commonly used in relational databases where one table may serve as a reference for another table, simplifying data retrieval and analysis.

The other descriptions do not accurately encapsulate the essence of many-to-one mapping. For instance, talking about a single value connecting to multiple results does not reflect the relationship as it does not emphasize the multiple instances being linked to a single result. Similarly, mentioning duplicate values or equivalence between the source and destination columns disrupts the clarity of the many-to-one concept. Thus, the correct answer highlights the structural relationship that is key to understanding many-to-one mapping in a database context.