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So for 1:1 optional relationships, take the primary key from the `mandatory end' and add it to the `optional end' as a foreign key.

A relationship captures how entities are related to one another. Relationships can be thought of as verbs , linking two or more nouns. Examples: an owns relationship between a company and a computer, a supervises relationship between an employee and a department, a performs relationship between an artist and a song, a proves relationship between a mathematician and a conjecture.

A relationship describes how entities interact. For example, the entity “carpenter” may be related to the entity “table” by the relationship “builds” or “makes”. Relationships are represented by diamond shapes and are labeled using verbs.

But we know more than the facts about each individual department being in one division. We know that all new departments will also be in just one division. And if there is a new division , it, too, will have departments that are unique to the division. So, instead of providing information in the form of statements about specific entities , we use a more powerful and concise format and provide information in the form of statements about relationships among entity types .

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A relationship captures how entities are related to one another. Relationships can be thought of as verbs , linking two or more nouns. Examples: an owns relationship between a company and a computer, a supervises relationship between an employee and a department, a performs relationship between an artist and a song, a proves relationship between a mathematician and a conjecture.

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But we know more than the facts about each individual department being in one division. We know that all new departments will also be in just one division. And if there is a new division , it, too, will have departments that are unique to the division. So, instead of providing information in the form of statements about specific entities , we use a more powerful and concise format and provide information in the form of statements about relationships among entity types .

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9.1.4.1 Adding Foreign Key Relationships Using an EER Diagram

A relationship describes how entities interact. For example, the entity “carpenter” may be related to the entity “table” by the relationship “builds” or “makes”. Relationships are represented by diamond shapes and are labeled using verbs.

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