SQL Aggregates and Formulas Quiz
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SQL Aggregates and Formulas Quiz

Test your knowledge on SQL aggregate functions and creating formulas in a SELECT statement. Learn about COUNT, SUM, AVG, MIN, and MAX functions, as well as how to perform calculations in SQL queries.

Created by
@LowCostAllegory

Questions and Answers

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

To describe the relationships between different types of data

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

Indexes

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

To describe the rules that hold between attributes in a system

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

<p>Zeroth Normal Form (0NF)</p> Signup and view all the answers

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

<p>All attributes must be atomic, with no repeating groups</p> Signup and view all the answers

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

<p>Normalization levels</p> 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)?

<p>To move the repeating group to a new data store</p> Signup and view all the answers

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

<p>Functional dependencies are used to create the entity-relationship diagram (ERD)</p> Signup and view all the answers

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

<p>It is used to create the primary key of a table</p> Signup and view all the answers

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

<p>0NF has atomic data elements, while 1NF has non-atomic data elements</p> Signup and view all the answers

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