Primary Key: This is a field or a group of fields in a table that uniquely identifies each record. The value of the primary key must be unique for every record, and it is required to add a record to the table. Without entering a primary key value, the record cannot be added.
Foreign Key: This is a key used to establish a relationship between two tables. It’s a field (or a group of fields) in one table that refers to the primary key of another table.
Candidate Key: A field or group of fields that could be used as the primary key in a table. There can be multiple candidate keys in a database. The primary key is chosen from these candidate keys, and the remaining ones are called alternate keys. If a candidate key is made of more than one field, it’s called a composite key.
Super Key: A super key is a set of fields that uniquely identifies a record in a table. It can also include extra fields that are not necessary for uniquely identifying the record, but still can identify it. For example, a combination of fields, including the ID field, can form a super key.
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