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Data Models into Database Designs
Which of the following situation requires the use of ID-dependent entities?
Association relationships only
Multivalued attributes only
Archetype/instance relationships only
All of the above use ID dependent entities
Correct Answer:
All of the above use ID dependent entities
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Data Models into Database Designs
A primary key should be defined as:
In a 1:1 relationship, the foreign key is placed in:
In a 1:N relationship, the foreign key is placed in:
The DBMS allows surrogate keys to be changed.
For every relationship, there are six possible referential integrity actions.
In 1:N relationships, which entity becomes the parent entity is arbitrary.
A foreign key is used to implement relationships between tables.
All primary keys are required.
When the parent entity is required, a new parent row can always be inserted.
When the parent entity is required, cascading updates and cascading deletions should be allowed or the associated actions on the parent should be prohibited.
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