I have data in different formats such as CSV,XLS etc. I have to import the data into my Drupal website and i have to create buttons which could provide different functions on that data such as addition,average etc.
And also if i make changes in my data sheet the changes should also be shown in my Drupal site.
Check on feeds module:
https://www.drupal.org/project/feeds
And it's helper modules, i.e.:
https://www.drupal.org/project/feeds_xls