Oracle 12c: SQL
Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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Chapter 1, Problem 7RQ

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Difference between a foreign key and a primary key:

Foreign keyPrimary key
A primary key attribute in one table is the foreign key for another table. In a logical way, a foreign key is used to establish a link between two tables.In relational databases, a primary key is a key that is used for identifying and defining the characteristics uniquely of each row.
A foreign key is used for identifying a row of another table uniquely.A primary key may have a single attribute or multiple attributes.
A foreign key may be a field or group of fields in a table. As a foreign key may be a column or group of columns.The primary key will contain a unique value for each row of data.
Foreign key must not be null when the minimum cardinality of a data in a column of a table is implied as one...

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