what is the difference between primary key and forigen key? how to do from two tables please explain?
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A primary key generally focuses on the uniqueness of the table Whereas foreign key is generally used to build a relationship between the two tables. Like we do in Appian Records Relationship.
The difference between Primary key and Foreign key is no different on Appian.
have you gone through above link? it has been explained with an example.
how it will do in DB?
Let me google this for you: www.geeksforgeeks.org/.../