Hi Smita, in your blog you are seeking suggestions about asking in the 1NF phase, for unique key or primary key (as the PK will be necessary in the 2NF phase).
It will be better to directly ask for a PK in the 1NF phase. You can do this in your next pull request, however; it will be better to finish the pull request 1257 with the issues already discussed, without introducing this new issue right now.