Drop "firstname" and "lastname"

The firstname and lastname columns of affiliations were used to establish a link to the professors table in the last exercise – so the appropriate professor IDs could be copied over. This only worked because there is exactly one corresponding professor for each row in affiliations. In other words: {firstname, lastname} is a candidate key of professors – a unique combination of columns.

It isn't one in affiliations though, because, as said in the video, professors can have more than one affiliation.

Because professors are referenced by professor_id now, the firstname and lastname columns are no longer needed, so it's time to drop them. After all, one of the goals of a database is to reduce redundancy where possible.

Drop the firstname and lastname columns from the affiliations table.

Exercise

Drop "firstname" and "lastname"

Instructions