10 Questions
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?
Zeroth Normal Form (0NF)
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
Which of the following is NOT a component of an entity-relationship diagram (ERD)?
Normalization levels
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
Which of the following statements about functional dependencies is NOT true?
Functional dependencies are used to create the entity-relationship diagram (ERD)
Which of the following is NOT a characteristic of a functional dependency?
It is used to create the primary key of a table
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
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.
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