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SQL Aggregates and Formulas Quiz

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Questions and Answers

What is the primary purpose of an entity-relationship model?

To enforce data integrity rules
To describe the relationships between different types of data (correct)
To create a visual representation of a database schema
To optimize database performance

Which of the following is NOT a component of an entity-relationship model?

Relationships
Attributes
Entities
Indexes (correct)

What is the purpose of functional dependencies in a database system?

To optimize query performance
To create a visual representation of the database schema
To describe the rules that hold between attributes in a system (correct)
To enforce data integrity constraints

Which normal form represents completely un-normalized data with redundancies and dependencies?

Zeroth Normal Form (0NF) (D) Signup and view all the answers

What is the main requirement for a data store to be in First Normal Form (1NF)?

All attributes must be atomic, with no repeating groups (A) Signup and view all the answers

Which of the following is NOT a component of an entity-relationship diagram (ERD)?

Normalization levels (C) Signup and view all the answers

What is the primary purpose of transforming a data store from Zeroth Normal Form (0NF) to First Normal Form (1NF)?

To move the repeating group to a new data store (B) Signup and view all the answers

Which of the following statements about functional dependencies is NOT true?

Functional dependencies are used to create the entity-relationship diagram (ERD) (B) Signup and view all the answers

Which of the following is NOT a characteristic of a functional dependency?

It is used to create the primary key of a table (A) Signup and view all the answers

What is the key difference between Zeroth Normal Form (0NF) and First Normal Form (1NF)?

0NF has atomic data elements, while 1NF has non-atomic data elements (A) Signup and view all the answers