secondary key
A record identified by 2 or more fields is said to have a composite key.
foreign key
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In the structure of a database, the part consisting of several uniquely named components called data fields. Several data records make up a data file, and several data files make up a database.
A category of data in databases is called a field. It represents a specific piece of information within a database record, such as a name or an address. Multiple fields are combined to form a database record, which is then organized in a table.
A record identified by 2 or more fields is said to have a composite key.
A record in the database is known as a tuple. A record that is identified by a combination of two fields has a composite key.
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record.