Preview Questions Data Modeling Concepts | Role Specific Skill

Question 1: You need to integrate data from multiple sources into a data warehouse. What is your first step?

Which action should you take?

Choose only one option

Perform data extraction and transformation

Define a data integration strategy

Create a staging area for raw data

Establish data cleansing processes

Question 2: You need to design a data warehouse schema for reporting purposes. What do you use?

Which action should you take?

Choose only one option

Implement a star schema

Use a snowflake schema

Create a hybrid schema

Use a normalized schema

Question 3: You need to model a scenario where an entity is a subtype of another entity. What is your approach?

Which action should you take?

Choose only one option

Use inheritance

Create a new entity to represent the subtype

Use foreign keys to link the subtype to the main entity

Use a composite key to manage the relationship

Question 4: How do you identify departments that have more employees than the average number of employees per department?

Which action should you take?

Choose only one option

Use a nested query with HAVING

Use a window function with COUNT()

Use a JOIN with aggregate functions

Use a CTE with aggregate functions

Question 5: Your data warehouse needs to support complex analytical queries. What is your approach?

Which action should you take?

Choose only one option

Implement OLAP cubes

Use advanced indexing techniques

Optimize the schema design

Use in-memory processing

Question 6: 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