Allowing users to choose between two sort options in a view I have a view of user accounts.

I want to allow visitors to the site to choose to sortthis view by login date or by account creation date in a view (Views 3, Drupal 7).

It's easy to expose the sort operator to users, but is there a way to let users select which sort is applied first (creation date or login date)?

I thought about just cloning the view, and then changing the sort on the second view and linking them together, but if possible I would like to avoid duplication.
You can do that with Better Exposed Filters. I've combined two sorts together that way before, one selected with Ajax refreshing sort, then having the secondary sort tied in with the same. I would checkout the handbook links on that page for more direction, they have some pretty extensive recipes there that you could use as a base to start from.

handbook page for further reference