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Data Models into Database Designs
A foreign key is used to implement relationships between tables.
True
Correct Answer:
True
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Data Models into Database Designs
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.
An intersection table is required to represent M:N relationships.
In a 1:1 relationship, the primary key placement is arbitrary.
For every relationship, there are six possible sets of minimum cardinalities.
Cascading updates refers to child rows being automatically deleted when a parent row is deleted.
Surrogate keys have much meaning for users.
When the parent entity is required, a new child row can always be inserted.
When transforming an entity-relationship model into a relational database design, each entity is represented as a table.
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