What might happen if you forget to set Unique Values in Access to Yes?

When Unique Values is set to Yes in an Access query, it filters the results to include only distinct entries based on the criteria specified. If this setting is overlooked and left at No, the query will return all matching records from the database, including duplicates. This means that for each product listed in the dataset, every instance will appear in the results. Therefore, you would indeed see duplicate entries for each product in the query.

In contrast, the other options do not apply in the context of forgetting to set Unique Values to Yes. An accurate list of unique products would only be obtained when that setting is appropriately enabled. Additionally, running a query without filtering for unique values does not inherently affect the speed or performance unless the dataset is significantly large and performance optimizations like uniqueness are implemented. Lastly, there will definitely be a noticeable change in the results of the query, as duplicates would appear, contradicting the notion that no change would occur.