Preview Questions Data Modeling Concepts | Role Specific Skill

Question 1: What approach would you take to handle historical data in a dimensional model?

Which action should you take?

Choose only one option

Use slowly changing dimensions to track changes over time

Purge historical data periodically to optimize database performance

Denormalize all historical data into a single table structure

Archive historical data offline to save database space

Question 2: You are tasked with creating an ER model for a new e-commerce application. What?s your first step?

Which action should you take?

Choose only one option

Identify the main entities such as Customer, Order, and Product.

Define the relationships between the entities.

Determine the attributes of each entity.

Validate the model with stakeholders.

Question 3: How do you represent the internal structure of a class in UML?

Which action should you take?

Choose only one option

Use a class diagram

Use a sequence diagram

Use a state diagram

Use an activity diagram

Question 4: How do you ensure efficient data retrieval in your database design?

Which action should you take?

Choose only one option

Use indexing

Optimize query performance

Use caching

Regularly monitor query performance

Question 5: You need to find employees who have been with the company for more than 5 years and have never been promoted. What do you do?

Which action should you take?

Choose only one option

Use a nested query with date functions and NOT EXISTS

Use a LEFT JOIN with promotion table

Use a CTE with conditional aggregation

Use a subquery with date conditions

Question 6: You need to represent the structure of a database schema. Which UML diagram is suitable?

Which action should you take?

Choose only one option

Use a class diagram

Use a sequence diagram

Use a state diagram

Use an activity diagram