Preview Questions Data Modeling Concepts | Role Specific Skill

Question 1: Your database has tables with high update anomalies. What is your normalization approach?

Which action should you take?

Choose only one option

Normalize up to Third Normal Form (3NF)

Normalize up to Second Normal Form (2NF)

Normalize up to Fourth Normal Form (4NF)

Use Boyce-Codd Normal Form (BCNF)

Question 2: You need to list all products that have not been sold in the last 6 months. What is your approach?

Which action should you take?

Choose only one option

Use a nested query with NOT EXISTS and date condition

Use a LEFT JOIN with sales table and date condition

Use a CTE with date functions

Use a subquery with date conditions

Question 3: 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 4: How do you model a scenario where an entity can exist independently but can also have optional relationships with other entities?

Which action should you take?

Choose only one option

Use optional foreign keys

Create a separate join table

Define the optional relationships in a different entity

Use subtypes and supertypes to handle the relationships

Question 5: How do you decide the appropriate level of abstraction in a dimensional model?

Which action should you take?

Choose only one option

Collaborate with business users to understand their reporting needs and expectations

Simplify the model by excluding less critical dimensions

Opt for maximum detail in all dimensions

Use personal judgment to decide the level of abstraction

Question 6: How do you ensure data integrity in your database design?

Which action should you take?

Choose only one option

Use primary and foreign keys

Implement validation rules

Regularly audit data

Use transactions