Can you use UNIQUE KEY as a replacement for Primary Key ?

webmaster — Thu, 29 Sep 2022 09:17:56 +0000

Both Keys are different. For Identifying each and every record in a table we use primary key.
To apply additional uniqueness for other columns on the table we use Unique Key.
Primary Keys are important for a table.
Internal users use Primary Key whereas external users use unique key as it contains some meaningful information.
When uniqueness is needed for multiple columns for a table, we use unique key for all columns and primary keys cannot be used in this case.
Primary key uses clustered index by default and unique key uses Non-clustered index.

primary keys vs unique keys - Wikitechy