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Composite key
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=== Complexity and storage === A composite key consists of multiple attributes and the composite key will be referenced in multiple tables as the foreign key, this uses a lot of disk space as multiple columns are being stored as the foreign key instead of just possibly one. This makes the schema complex and the queries become more CPU expensive as for every join the DBMS will need to compare three attributes instead of just possibly one in case of a single natural key.
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