Is there a way to limit the number of random values for a given field? For example if I want to create a table with a first_name column, but I only want about 25 unique first names within the table, is there a way to specify that? I don't care what the names are, just that the set is limited. Same with fields like city or country. I don't want a table with 200 different country names or 2000 different cities. I want a table with 1000 rows but only 12 different countries and 50 different cities within it.