Question

explain primary and forgein key​

Answer 1

Answer:

Difference between Primary Key and Foreign Key - Dot Net Tricks Primary key uniquely identify a record in the table. Foreign key is a field in the table that is primary key in another table. Primary Key can't accept null values. Foreign key can accept multiple null value.

Answer 2

Answer:

Primary key uniquely identify a record in the table. Foreign key is a field in the table that is primary key in another table. ... Foreign key can accept multiple null value. By default, Primary key is clustered index and data in the database table is physically organized in the sequence of clustered index.