Preview Questions Data Modeling Concepts | Role Specific Skill

Question 1: How do you handle optional relationships in an ER model?

Which action should you take?

Choose only one option

Use optional foreign keys

Create a separate entity for optional relationships

Define optional attributes in the entity

Implement a flexible schema design

Question 2: How do you depict the architecture of a system in UML?

Which action should you take?

Choose only one option

Use a component diagram

Use a class diagram

Use a sequence diagram

Use a state diagram

Question 3: You find that some tables in your database are denormalized for performance. What do you do?

Which action should you take?

Choose only one option

Evaluate and balance performance vs. normalization

Normalize to Third Normal Form (3NF)

Normalize to Second Normal Form (2NF)

Normalize to Fourth Normal Form (4NF)

Question 4: A client requests a detailed ER model for their employee database. Which feature would you prioritize?

Which action should you take?

Choose only one option

Clearly define primary keys for each entity

Ensure each entity has well-defined attributes

Accurately model relationships between entities

Include detailed descriptions for each attribute

Question 5: How do you ensure data quality in your dimensional model?

Which action should you take?

Choose only one option

Implement data validation rules

Use ETL processes to cleanse data

Regularly audit and reconcile data

Apply data profiling techniques

Question 6: You need to find the top 5 products based on sales revenue in each category. What SQL statement do you use?

Which action should you take?

Choose only one option

Use a window function with RANK()

Use a nested query with ORDER BY and LIMIT

Use a CTE with ROW_NUMBER()

Use a subquery with GROUP BY and HAVING