Composite key

From Oracle FAQ

A composite key is a primary key that consists of more than one column. Also known as a concatenated key or aggregate key.

Example

For example, the LINE_ITEMS table may have a composite key on {orderID, itemNumber}:

CREATE TABLE line_items (
  orderID    NUMBER,
  itemNumber NUMBER,
  productId  NUMBER,
  quantity   NUMBER,
  PRIMARY KEY (orderID, itemNumber));

Also see

• Primary key

Glossary of Terms
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