I was a little confused by the entity discussion in class. I wrote that entities are "anything about which data are to be collected and stored" and that an "entity can be anything, even abstract."
But do entities HAVE to be abstract? Is that a prerequisite? This might not even matter, but it seemed like the lecture indicated at times that yes, entities are indeed abstract.
Thanks!
No, entities don't have to be abstract. In my experience at least, they have usually been concrete. For example, I used to work for a company that ran summer camps, so the entities in our database were things like Camper, Family, Registration, etc.
ReplyDeleteThe relationships between the three I just listed are Family -->(can have many-->Camper-->(can have many)-->Registration.
...hope i didn't just confuse you more.