Unique constraints or keys can be used to retain the uniqueness of combinations of fields replaced as a primary key with a generated ID. They enable you enforce 1 -1 relationship. There may be one Primary Key for one table and many unique key constraints for one table.
Which key retains its uniqueness even after you remove some of the fields?
The____ retains its uniqueness even after you remove some of the fields.
The answer is Super Key
A super key is any combination of keys within a table that uniquely identifies each record within that table. For example, the primary key is a subset of super keys. The difference between a candidate key and a super key is that a super key retains its uniqueness even after you remove some fields
