What is the main advantage of using subsets of records in database queries?

Using subsets of records in database queries primarily serves to reduce waiting time during command execution. When a query is executed on a large dataset, retrieving only the necessary records instead of the entire dataset can significantly decrease the time it takes to process and return results. This efficiency is crucial in situations where immediate feedback is required or when working with limited computational resources.

By focusing on a specific subset, users can tailor their queries to return only the relevant information needed for analysis or reporting. This not only enhances performance but also makes it easier to work with data, as you can streamline the results to fit the specific requirements of the query.

The other possible options do not align with the main advantage of using subsets in the context of query efficiency. Increasing the size of the dataset, for instance, would counteract the benefits of using subsets. Similarly, ensuring all records are returned would negate the purpose of filtering to improve performance, and standardizing output format is generally unrelated to the advantage of using subsets in queries.