Difference between Primary key and Foreign key

Hi Dear,

 This article we will discuss what is the difference between primary key and

 Foreign key. It is also a common interview question. Most of time at interview you will face this question.

Primary key	Foreign Key
1- Primary key uniquely identify a record in the table	1- Foreign key is a field in the table that is primary key in another table
2-  Primary Key can't accept null values	2- Foreign key can accept multiple null values.
3- We can have only one Primary key in a table.	3- We can have more than one foreign key in a table