Question

explain primary key and foreign key with the help of an example​

Answer 1

Answer:

In simpler words, the foreign key is defined in a second table, but it refers to the primary key in the first table. For example, a table called Employee has a primary key called employee_id

A foreign key is a column or group of columns in a relational database table that provides a link between data in two tables.

Explanation:

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Answer 2

• A primary key constrain is a column that uniquely identifies every row in the table of the relational database management system, while foreign key is a column that creates a relationship between two tables.

• Primary Key never accepts null values whereas foreign key may accept multiple null values.

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