Both queries 1 and 3 generate the same output because they logically exclude the same set of values from the results. Query 1 uses "NOT IN (10, 20)", omitting any rows where prod_list is either 10 or 20. Similarly, Query 3 uses "<> ALL (10, 20)", which also excludes any rows where prod_list equals 10 or 20. Query 2 uses "<> ANY (10, 20)", which means it will include rows where prod_list doesn't match any of the values in the list, providing a broader range of results not limited to values not in the entire list.