Im learning about databases, I would like to know that is it possible to have a column in a table which gets its Foreign key from another table and at the same time has a primary key?
For example:
X: class, teacher
Y:class(FK,PK)?,teacher
Having FK and PK on same column? cardinality/SQL
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Yes, it is.
This is often used to represent a 1-1 relationship, or many-to-many relationships when there is a composite primary key across columns which are all foreign keys
The most common place I have seen it is in relationships created by ORMs to represent inheritance.