What Does Key Mean?
A key is a field, or combination of fields, in a database table used to retrieve and sort rows in the table based on certain requirements. Keys are defined to speed up access to data and, in many cases, to create links between different tables.
Techopedia Explains Key
Relational databases mostly involve primary and foreign keys. While primary keys enforce entity integrity and hold unique values, foreign keys maintain referential integrity, creating an association between two tables.
