compound key meaning

[Computer]
<database> (Or "multi-part key", "concatenated key") A key which consists of more than one attribute of the body of information (e.g. database "record") it identifies.

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1. Indeed, a foreign key may itself be a compound key.
2. These keys are referred to as aggregate or compound keys.
3. Surrogate keys are also less expensive to join ( fewer columns to compare ) than compound keys.
4. Any column can be a key, or multiple columns can be grouped together into a compound key.
5. This means that any one, none, or all, of the multiple attributes within the compound key can be foreign keys.