Podcast
Questions and Answers
What is a relation in the context of a Relational DBMS?
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?
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?
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?
How many primary keys can a relation have according to the text?
What is the purpose of candidate keys in a relation?
What is the purpose of candidate keys in a relation?
Which of the following is NOT a characteristic of relations in a Relational DBMS?
Which of the following is NOT a characteristic of relations in a Relational DBMS?
What is the solid line connecting an I D-dependent entity and its parent called?
What is the solid line connecting an I D-dependent entity and its parent called?
Which type of entity is considered weak?
Which type of entity is considered weak?
What is a weak entity in data modeling?
What is a weak entity in data modeling?
Which type of relationship is used to represent ID-Dependent entities?
Which type of relationship is used to represent ID-Dependent entities?
What is the dashed line connecting strong entities or non-ID-dependent weak entities to their parent called?
What is the dashed line connecting strong entities or non-ID-dependent weak entities to their parent called?
How are weak entities that are not ID-Dependent represented in data modeling tools?
How are weak entities that are not ID-Dependent represented in data modeling tools?
What is the purpose of an intersection table in a N:M relationship between strong entities?
What is the purpose of an intersection table in a N:M relationship between strong entities?
In an association table, what additional feature does it have compared to an intersection table?
In an association table, what additional feature does it have compared to an intersection table?
What occurs in a cascading update between a parent and child in a database?
What occurs in a cascading update between a parent and child in a database?
When is cascading delete generally applied for strong entities?
When is cascading delete generally applied for strong entities?
What type of entities do not require cascading updates when changes are made?
What type of entities do not require cascading updates when changes are made?
What does an intersection table hold in a N:M relationship?
What does an intersection table hold in a N:M relationship?
