Can it be considered a reference table. with ext. connection?

Question

Database

Good afternoon!
Can it be considered a reference table. with ext. connection? For example, a city with a country key. Or If an image_id (city image) is added to the directory. I understand that the thing is conditional.

Answer 1

In principle, a directory is an entity. In the DBMS, each ruler is an entity. That is, the parity in properties between objects - entities and records in the DBMS will be
Entity / object - a record in the DBMS.
Otherwise, imagine you have a
"Directory" table.
You have a program, the program has a DBMS client, and using this client you enter the "Directory" table into the DBMS
.
Russian language
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10 minutes pass and the developer likes what happened so much that he decides to dispose of another directory in the same way, now these are the names of cities with a number.
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And how can you now identify these directories, which record belongs to which directory? This can no longer be done.
Perhaps the example is a little far-fetched, but it seems to me that the essence is described well.