रिलेशनल डेटाबेस सिस्टम में, एक न्यूनतम सुपर की (minimal super key) को औपचारिक रूप से किस रूप में जाना जाता है?

The Dandi March, also known as the Salt Satyagraha, was led by which influential leader?

Which act formally granted independence to India, marking the end of British rule?

Who was the key figure in establishing the Indian National Congress?