In a relational database design,all relationships are expressed by ________.
A)creating a primary key
B)creating a foreign key
C)creating a supertype
D)creating a subtype

Question

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In a relational database design, relationships between tables are expressed by creating foreign keys. A foreign key is a field in one table that refers to the primary key in another table. This establishes a connection between the two tables, allowing them to be joined and queried together. A primary key, on the other hand, uniquely identifies each record in a table and is not used to express relationships between tables. Supertype and subtype are concepts used in object-oriented programming and are not directly related to relational database design.

In a Relational Database Design,all Relationships Are Expressed by ________