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Transformation of N:N Relationship: Intersection vs. Association Tables

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Transformation of N:N Relationship: Intersection vs. Association Tables

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Questions and Answers

What is a relation in the context of a Relational DBMS?

A three-dimensional table

A one-dimensional table

A two-dimensional table (correct)

A four-dimensional table

In a relation, what do columns typically contain?

Data about entities

Data about relationships

Data about attributes of the entities (correct)

Data about the database structure

What is a characteristic of entries in a column in a relation?

They are of the same kind (correct)

They are of different kinds

They are multivalued

They are unordered

How many primary keys can a relation have according to the text?

One (A) Signup and view all the answers

What is the purpose of candidate keys in a relation?

To identify rows uniquely (C) Signup and view all the answers

Which of the following is NOT a characteristic of relations in a Relational DBMS?

There can be multivalued attributes (C) Signup and view all the answers

What is the solid line connecting an I D-dependent entity and its parent called?

Identifying relationship (B) Signup and view all the answers

Which type of entity is considered weak?

ID-Dependent entity (C) Signup and view all the answers

What is a weak entity in data modeling?

An entity whose existence depends on another entity (C) Signup and view all the answers

Which type of relationship is used to represent ID-Dependent entities?

Identifying relationship (B) Signup and view all the answers

What is the dashed line connecting strong entities or non-ID-dependent weak entities to their parent called?

Nonidentifying relationship (B) Signup and view all the answers

How are weak entities that are not ID-Dependent represented in data modeling tools?

With nonidentifying relationships (A) Signup and view all the answers

What is the purpose of an intersection table in a N:M relationship between strong entities?

To hold the relationships between two strong entities (D) Signup and view all the answers

In an association table, what additional feature does it have compared to an intersection table?

It includes attributes specific to the associations of the other two entities (C) Signup and view all the answers

What occurs in a cascading update between a parent and child in a database?

Child's primary key changes when parent's primary key changes (B) Signup and view all the answers

When is cascading delete generally applied for strong entities?

Always (B) Signup and view all the answers

What type of entities do not require cascading updates when changes are made?

Surrogate key-dependent entities (D) Signup and view all the answers

What does an intersection table hold in a N:M relationship?

Only the primary keys of the two entities (B) Signup and view all the answers