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Data Models into Database Designs
When the parent entity is required, cascading updates and cascading deletions should be allowed or the associated actions on the parent should be prohibited.
True
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True
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Data Models into Database Designs
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.
When the parent entity is required and the parent has a surrogate key, update actions can be ignored.
An ideal primary key is short, numeric and seldom changing.
Intersection tables are ID-dependent on both their parent tables.
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