sql查询显示products_description?

I have a database with a Table called products_description, it has a column called products_name, inside products_name are 12000 entries but there are only about 200 different entry names, the question is how can I show only the 200 entries without showing copies of the same entry? eg fred which may be shown 30 times. I want to end up with a list of names from products_name column without copies. eg fred, tom, jack, thanksI have a database with a Table called products_