Choosing appropriate primary key

[Yrstruly2021]

Please advise what would be the proper manner in selecting a primary key when there is no column(s)columns to assign as a unique  identified column. I know about composite keys(selecting more than one column as a primary key). This also seem's not possible.

[lbendlin]

What business question are you trying to answer?  That will dictate the shape of your data model.