Preview Questions Data Modeling Concepts | Role Specific Skill

Question 1: What is your approach to handling schema changes in a database?

Which action should you take?

Choose only one option

Use version control for schema changes

Implement rollback procedures

Regularly test schema changes

Communicate changes to all stakeholders

Question 2: How do you model the hierarchy and relationships of classes in a system?

Which action should you take?

Choose only one option

Use a class diagram

Use a sequence diagram

Use a state diagram

Use a component diagram

Question 3: How do you represent a composite 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 handle data warehouse maintenance?

Which action should you take?

Choose only one option

Implement automated maintenance processes

Regularly monitor performance

Schedule regular data updates and backups

Use maintenance windows

Question 5: You need to find customers who have placed at least one order in every month of the current year. What is your approach?

Which action should you take?

Choose only one option

Use a nested query with COUNT() and GROUP BY

Use a window function with COUNT()

Use a CTE with conditional aggregation

Use a subquery with date functions

Question 6: You need to find employees who have the highest salary in each department. What SQL statement do you use?

Which action should you take?

Choose only one option

Use a nested query with GROUP BY and HAVING

Use a JOIN with a subquery

Use a CTE (Common Table Expression)

Use a window function with PARTITION BY