# Ideas for implementing an UI for set combinations in rails **URL:** \ **Category:** Rails\ **Created:** [March 13, 2009, 7:44am UTC](https://www.ruby-forum.com/t/ideas-for-implementing-an-ui-for-set-combinations-in-rails/162727 "2009-03-13T07:44:09Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [March 13, 2009, 7:44am UTC](https://www.ruby-forum.com/t/ideas-for-implementing-an-ui-for-set-combinations-in-rails/162727/1 "2009-03-13T07:44:09Z")
Hi, Iam rails newbie. I have to implement a UI design for 3 tables based on set theory. I thought a lot of a lot of ideas in the past few days but nothing seemed to fulfil my necessity Say i have tables a, b and c I should be able to do like a n b a u b b - a (b - a) n c etc… If any web developers well versed in ui designs out there have some suggestions of doing it, i would appreciate it 🙂 Regards, Vimal Das ---
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [March 13, 2009, 10:06am UTC](https://www.ruby-forum.com/t/ideas-for-implementing-an-ui-for-set-combinations-in-rails/162727/2 "2009-03-13T10:06:22Z")
I don’t fully understand. For example when you ask for the intersection ‘a n b’ do you mean all records that are the same in the two tables or the intersection of the fields of the tables (ie fields that exist in in both tables). If you mean those records that exist in both, do the tables have all the same fields? Or maybe a combination of both. 2009/3/13 vimal [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)