Preview Questions Data Modeling Concepts | Role Specific Skill

Question 1: Your database design needs to support complex queries. What is your approach?

Which action should you take?

Choose only one option

Optimize schema design

Use indexing

Implement caching

Use materialized views

Question 2: How do you model a situation where an entity Vehicle can be either a Car or a Truck, but not both?

Which action should you take?

Choose only one option

Use a superclass Vehicle and subclasses Car and Truck.

Use a multivalued attribute.

Use a composite attribute.

Use a derived attribute.

Question 3: In your ER model, you have an entity Employee and an entity Department. How do you ensure each employee belongs to one department?

Which action should you take?

Choose only one option

Add a foreign key in Employee referencing Department.

Add a foreign key in Department referencing Employee.

Create an associative entity between Employee and Department.

Define a many-to-many relationship between Employee and Department.

Question 4: What is your approach to designing a database for a distributed system?

Which action should you take?

Choose only one option

Use distributed databases

Implement data replication

Use data sharding

Regularly monitor data distribution

Question 5: How do you identify employees who earn above the average salary of their department?

Which action should you take?

Choose only one option

Use a nested query with AVG()

Use a window function with PARTITION BY and AVG()

Use a CTE with AVG()

Use a subquery with GROUP BY

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