I noticed that a lot of database schemas often show like, "students" or "teachers" or "employees" or "passengers" or something to that affect.
Why not have a schema where every individual is a person and is in Persons table and if went to look for "student", we call "students" table which links its person id to the id in Persons table to get data.
Students may become teachers so the data from students table can be updated/removed and be added in "teachers" table.
Why is that not common? What would be a problem with having "Persons" table rather than to have a table of people of a given position?