Difference between primary key and a unique key?
Primary Key: In the need of a primary key there must be at least one key at the table and with the use of this key it helps in blocking the duplicate and the also the null value.
Unique Key: Whereas, in the unique key process, there can be more than one key in the table and here it will block the duplicated value and will rather accept the null value.
BY Best Interview Question ON 19 Dec 2019