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A link between tables that references the primary key in one table to a foreign key in another table.The relationship line is represented in a database diagram by a solid line if referential integrity between tables is enforced, or a dashed line if referential integrity is not enforced for INSERT and UPDATE transactions.Conceptual connection between two or more entities in entity-relationship modelling.Relationships may be one-to-one, one-to-many or many-to-many.Eventually, a static connection between two or more objects, that is commonly implemented using pointer reference.A statement about how two or more entities are related and the restrictions placed on that relationship.Relationships may be one-to-one, one-to-many, many-to-one, or many-to-many.

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(See the category on relationships.)A link between two entities that's based on attributes of the entities.

For example, the Department and Employee entities can have a relationship based on the dept ID attribute as a foreign key in Employee, and as the primary key in Department note that although the join attribute dept ID is the same for the source and destination entities in this example, it doesn't have to be.

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