What keyword should be used in USQL to filter the result set to a specific number of entries?

The keyword used in USQL to filter the result set to a specific number of entries is LIMIT. This command is instrumental in controlling the size of the results returned by a query, allowing users to specify the maximum number of rows they wish to retrieve. This is especially useful in scenarios where large datasets are involved, and only a subset of the data is needed for analysis or display.

For example, if a user wishes to view only a certain number of rows from a large dataset, incorporating the LIMIT keyword in the query will enable this functionality, making data retrieval more manageable and efficient.

The other choices, such as MAX, TOP, and NUM, do not serve the same purpose in USQL. MAX is typically used to obtain the highest value from a specified column, TOP might be used in some SQL dialects but is not the correct USQL keyword for limiting results, and NUM is not a recognized keyword in this context. Therefore, LIMIT stands out as the appropriate choice for this requirement.