Data ETL Data Warehouse Modeling MCQ Questions with Answers (Latest 2026)
Practice Data ETL Data Warehouse Modeling MCQ questions with detailed explanations and clear answer validation. These MCQs help you revise core concepts, compare close options, and improve accuracy for interviews, certification exams, and technical screening rounds. Use this updated 2026 set to strengthen fundamentals and confidence.
Answer: Fact table surrounded by denormalized dim tables.
Here, Fact table surrounded by denormalized dim tables. is the right choice. Common DW pattern. It aligns directly with what the question asks about which option best describes a star schema. A quick elimination of partially true options helps confirm it.
Q2. What is the primary purpose of a star schema?
Select an answer to check.
Answer: Fact table surrounded by denormalized dim tables.
In this case, Fact table surrounded by denormalized dim tables. is correct. Common DW pattern. It aligns directly with what the question asks about what is the primary purpose of a star. A quick elimination of partially true options helps confirm it.
Q3. Which statement about a star schema is most accurate?
Select an answer to check.
Answer: Fact table surrounded by denormalized dim tables.
The best option here is Fact table surrounded by denormalized dim tables.. Common DW pattern. It aligns directly with what the question asks about which statement about a star schema is most. A quick elimination of partially true options helps confirm it.
Q4. How is a star schema best characterized?
Select an answer to check.
Answer: Fact table surrounded by denormalized dim tables.
For this question, Fact table surrounded by denormalized dim tables. is correct. Common DW pattern. It aligns directly with what the question asks about how is a star schema best characterized. A quick elimination of partially true options helps confirm it.
Q5. Which option best describes a snowflake schema?
Select an answer to check.
Answer: Normalized dimension tables form snowflake.
Normalized dimension tables form snowflake. is the correct answer here. More normalized than star. It aligns directly with what the question asks about which option best describes a snowflake schema. A quick elimination of partially true options helps confirm it.
Q6. What is the primary purpose of a snowflake schema?
Select an answer to check.
Answer: Normalized dimension tables form snowflake.
Here, Normalized dimension tables form snowflake. is the right choice. More normalized than star. This matches the core idea being tested around what is the primary purpose of a snowflake. A quick elimination of partially true options helps confirm it.
Q7. Which statement about a snowflake schema is most accurate?
Select an answer to check.
Answer: Normalized dimension tables form snowflake.
In this case, Normalized dimension tables form snowflake. is correct. More normalized than star. This matches the core idea being tested around which statement about a snowflake schema is most. A quick elimination of partially true options helps confirm it.
Q8. How is a snowflake schema best characterized?
Select an answer to check.
Answer: Normalized dimension tables form snowflake.
The best option here is Normalized dimension tables form snowflake.. More normalized than star. This matches the core idea being tested around how is a snowflake schema best characterized. A quick elimination of partially true options helps confirm it.
Q9. Which option best describes a fact table?
Select an answer to check.
Answer: Stores measurable events with FKs to dims.
For this question, Stores measurable events with FKs to dims. is correct. Center of star/snowflake. This matches the core idea being tested around which option best describes a fact table. A quick elimination of partially true options helps confirm it.
Q10. What is the primary purpose of a fact table?
Select an answer to check.
Answer: Stores measurable events with FKs to dims.
Stores measurable events with FKs to dims. is the correct answer here. Center of star/snowflake. This matches the core idea being tested around what is the primary purpose of a fact. A quick elimination of partially true options helps confirm it.
Q11. Which statement about a fact table is most accurate?
Select an answer to check.
Answer: Stores measurable events with FKs to dims.
Here, Stores measurable events with FKs to dims. is the right choice. Center of star/snowflake. That is exactly the concept behind which statement about a fact table is most in this context. A quick elimination of partially true options helps confirm it.
Q12. How is a fact table best characterized?
Select an answer to check.
Answer: Stores measurable events with FKs to dims.
In this case, Stores measurable events with FKs to dims. is correct. Center of star/snowflake. That is exactly the concept behind how is a fact table best characterized in this context. A quick elimination of partially true options helps confirm it.
Q13. Which option best describes a dimension table?
Select an answer to check.
Answer: Descriptive attributes referenced by facts.
The best option here is Descriptive attributes referenced by facts.. Periphery of star. That is exactly the concept behind which option best describes a dimension table in this context. A quick elimination of partially true options helps confirm it.
Q14. What is the primary purpose of a dimension table?
Select an answer to check.
Answer: Descriptive attributes referenced by facts.
For this question, Descriptive attributes referenced by facts. is correct. Periphery of star. That is exactly the concept behind what is the primary purpose of a dimension in this context. A quick elimination of partially true options helps confirm it.
Q15. Which statement about a dimension table is most accurate?
Select an answer to check.
Answer: Descriptive attributes referenced by facts.
Descriptive attributes referenced by facts. is the correct answer here. Periphery of star. That is exactly the concept behind which statement about a dimension table is most in this context. A quick elimination of partially true options helps confirm it.
Q16. How is a dimension table best characterized?
Select an answer to check.
Answer: Descriptive attributes referenced by facts.
Here, Descriptive attributes referenced by facts. is the right choice. Periphery of star. It fits the requirement in the prompt about how is a dimension table best characterized. A quick elimination of partially true options helps confirm it.
Q17. Which option best describes a grain?
Select an answer to check.
Answer: Lowest level of detail in a fact table.
In this case, Lowest level of detail in a fact table. is correct. Define before modeling. It fits the requirement in the prompt about which option best describes a grain. A quick elimination of partially true options helps confirm it.
Q18. What is the primary purpose of a grain?
Select an answer to check.
Answer: Lowest level of detail in a fact table.
The best option here is Lowest level of detail in a fact table.. Define before modeling. It fits the requirement in the prompt about what is the primary purpose of a grain. A quick elimination of partially true options helps confirm it.
Q19. Which statement about a grain is most accurate?
Select an answer to check.
Answer: Lowest level of detail in a fact table.
For this question, Lowest level of detail in a fact table. is correct. Define before modeling. It fits the requirement in the prompt about which statement about a grain is most accurate. A quick elimination of partially true options helps confirm it.
Q20. How is a grain best characterized?
Select an answer to check.
Answer: Lowest level of detail in a fact table.
Lowest level of detail in a fact table. is the correct answer here. Define before modeling. It fits the requirement in the prompt about how is a grain best characterized. A quick elimination of partially true options helps confirm it.
Q21. Which option best describes a measure?
Select an answer to check.
Answer: Numeric metric in a fact (sum-able).
Here, Numeric metric in a fact (sum-able). is the right choice. Aggregated in queries. This is the most accurate statement for which option best describes a measure. A quick elimination of partially true options helps confirm it.
Q22. What is the primary purpose of a measure?
Select an answer to check.
Answer: Numeric metric in a fact (sum-able).
In this case, Numeric metric in a fact (sum-able). is correct. Aggregated in queries. This is the most accurate statement for what is the primary purpose of a measure. A quick elimination of partially true options helps confirm it.
Q23. Which statement about a measure is most accurate?
Select an answer to check.
Answer: Numeric metric in a fact (sum-able).
The best option here is Numeric metric in a fact (sum-able).. Aggregated in queries. This is the most accurate statement for which statement about a measure is most accurate. A quick elimination of partially true options helps confirm it.
Q24. How is a measure best characterized?
Select an answer to check.
Answer: Numeric metric in a fact (sum-able).
For this question, Numeric metric in a fact (sum-able). is correct. Aggregated in queries. This is the most accurate statement for how is a measure best characterized. A quick elimination of partially true options helps confirm it.
Q25. Which option best describes an additive measure?
Select an answer to check.
Answer: Sums across all dimensions.
Sums across all dimensions. is the correct answer here. Easiest to aggregate. This is the most accurate statement for which option best describes an additive measure. A quick elimination of partially true options helps confirm it.
Q26. What is the primary purpose of an additive measure?
Select an answer to check.
Answer: Sums across all dimensions.
Here, Sums across all dimensions. is the right choice. Easiest to aggregate. It aligns directly with what the question asks about what is the primary purpose of an additive. The other options are either incomplete or contextually incorrect.
Q27. Which statement about an additive measure is most accurate?
Select an answer to check.
Answer: Sums across all dimensions.
In this case, Sums across all dimensions. is correct. Easiest to aggregate. It aligns directly with what the question asks about which statement about an additive measure is most. The other options are either incomplete or contextually incorrect.
Q28. How is an additive measure best characterized?
Select an answer to check.
Answer: Sums across all dimensions.
The best option here is Sums across all dimensions.. Easiest to aggregate. It aligns directly with what the question asks about how is an additive measure best characterized. The other options are either incomplete or contextually incorrect.
Q29. Which option best describes semi-additive?
Select an answer to check.
Answer: Sums across some dimensions but not time.
For this question, Sums across some dimensions but not time. is correct. E.g., balances. It aligns directly with what the question asks about which option best describes semi-additive. The other options are either incomplete or contextually incorrect.
Q30. What is the primary purpose of semi-additive?
Select an answer to check.
Answer: Sums across some dimensions but not time.
Sums across some dimensions but not time. is the correct answer here. E.g., balances. It aligns directly with what the question asks about what is the primary purpose of semi-additive. The other options are either incomplete or contextually incorrect.
Q31. Which statement about semi-additive is most accurate?
Select an answer to check.
Answer: Sums across some dimensions but not time.
Here, Sums across some dimensions but not time. is the right choice. E.g., balances. This matches the core idea being tested around which statement about semi-additive is most accurate. The other options are either incomplete or contextually incorrect.
Q32. How is semi-additive best characterized?
Select an answer to check.
Answer: Sums across some dimensions but not time.
In this case, Sums across some dimensions but not time. is correct. E.g., balances. This matches the core idea being tested around how is semi-additive best characterized. The other options are either incomplete or contextually incorrect.
Q33. Which option best describes non-additive?
Select an answer to check.
Answer: Cannot be summed (e.g., percentages).
The best option here is Cannot be summed (e.g., percentages).. Use averages or ratios. This matches the core idea being tested around which option best describes non-additive. The other options are either incomplete or contextually incorrect.
Q34. What is the primary purpose of non-additive?
Select an answer to check.
Answer: Cannot be summed (e.g., percentages).
For this question, Cannot be summed (e.g., percentages). is correct. Use averages or ratios. This matches the core idea being tested around what is the primary purpose of non-additive. The other options are either incomplete or contextually incorrect.
Q35. Which statement about non-additive is most accurate?
Select an answer to check.
Answer: Cannot be summed (e.g., percentages).
Cannot be summed (e.g., percentages). is the correct answer here. Use averages or ratios. This matches the core idea being tested around which statement about non-additive is most accurate. The other options are either incomplete or contextually incorrect.
Q36. How is non-additive best characterized?
Select an answer to check.
Answer: Cannot be summed (e.g., percentages).
Here, Cannot be summed (e.g., percentages). is the right choice. Use averages or ratios. That is exactly the concept behind how is non-additive best characterized in this context. The other options are either incomplete or contextually incorrect.
Q37. Which option best describes a degenerate dimension?
Select an answer to check.
Answer: Dim attribute stored on the fact (e.g., order id).
In this case, Dim attribute stored on the fact (e.g., order id). is correct. Avoids tiny dim tables. That is exactly the concept behind which option best describes a degenerate dimension in this context. The other options are either incomplete or contextually incorrect.
Q38. What is the primary purpose of a degenerate dimension?
Select an answer to check.
Answer: Dim attribute stored on the fact (e.g., order id).
The best option here is Dim attribute stored on the fact (e.g., order id).. Avoids tiny dim tables. That is exactly the concept behind what is the primary purpose of a degenerate in this context. The other options are either incomplete or contextually incorrect.
Q39. Which statement about a degenerate dimension is most accurate?
Select an answer to check.
Answer: Dim attribute stored on the fact (e.g., order id).
For this question, Dim attribute stored on the fact (e.g., order id). is correct. Avoids tiny dim tables. That is exactly the concept behind which statement about a degenerate dimension is most in this context. The other options are either incomplete or contextually incorrect.
Q40. How is a degenerate dimension best characterized?
Select an answer to check.
Answer: Dim attribute stored on the fact (e.g., order id).
Dim attribute stored on the fact (e.g., order id). is the correct answer here. Avoids tiny dim tables. That is exactly the concept behind how is a degenerate dimension best characterized in this context. The other options are either incomplete or contextually incorrect.
Q41. Which option best describes a junk dimension?
Select an answer to check.
Answer: Bag of low-cardinality flags into one dim.
Here, Bag of low-cardinality flags into one dim. is the right choice. Keeps fact narrow. It fits the requirement in the prompt about which option best describes a junk dimension. The other options are either incomplete or contextually incorrect.
Q42. What is the primary purpose of a junk dimension?
Select an answer to check.
Answer: Bag of low-cardinality flags into one dim.
In this case, Bag of low-cardinality flags into one dim. is correct. Keeps fact narrow. It fits the requirement in the prompt about what is the primary purpose of a junk. The other options are either incomplete or contextually incorrect.
Q43. Which statement about a junk dimension is most accurate?
Select an answer to check.
Answer: Bag of low-cardinality flags into one dim.
The best option here is Bag of low-cardinality flags into one dim.. Keeps fact narrow. It fits the requirement in the prompt about which statement about a junk dimension is most. The other options are either incomplete or contextually incorrect.
Q44. How is a junk dimension best characterized?
Select an answer to check.
Answer: Bag of low-cardinality flags into one dim.
For this question, Bag of low-cardinality flags into one dim. is correct. Keeps fact narrow. It fits the requirement in the prompt about how is a junk dimension best characterized. The other options are either incomplete or contextually incorrect.
Q45. Which option best describes a role-playing dimension?
Select an answer to check.
Answer: Same dim used multiple times (e.g., order/ship dates).
Same dim used multiple times (e.g., order/ship dates). is the correct answer here. Use views/aliases. It fits the requirement in the prompt about which option best describes a role-playing dimension. The other options are either incomplete or contextually incorrect.
Q46. What is the primary purpose of a role-playing dimension?
Select an answer to check.
Answer: Same dim used multiple times (e.g., order/ship dates).
Here, Same dim used multiple times (e.g., order/ship dates). is the right choice. Use views/aliases. This is the most accurate statement for what is the primary purpose of a role-playing. The other options are either incomplete or contextually incorrect.
Q47. Which statement about a role-playing dimension is most accurate?
Select an answer to check.
Answer: Same dim used multiple times (e.g., order/ship dates).
In this case, Same dim used multiple times (e.g., order/ship dates). is correct. Use views/aliases. This is the most accurate statement for which statement about a role-playing dimension is most. The other options are either incomplete or contextually incorrect.
Q48. How is a role-playing dimension best characterized?
Select an answer to check.
Answer: Same dim used multiple times (e.g., order/ship dates).
The best option here is Same dim used multiple times (e.g., order/ship dates).. Use views/aliases. This is the most accurate statement for how is a role-playing dimension best characterized. The other options are either incomplete or contextually incorrect.
Q49. Which option best describes conformed dimensions?
Select an answer to check.
Answer: Shared dims used across facts/marts.
For this question, Shared dims used across facts/marts. is correct. Enable cross-mart analysis. This is the most accurate statement for which option best describes conformed dimensions. The other options are either incomplete or contextually incorrect.
Q50. What is the primary purpose of conformed dimensions?
Select an answer to check.
Answer: Shared dims used across facts/marts.
Shared dims used across facts/marts. is the correct answer here. Enable cross-mart analysis. This is the most accurate statement for what is the primary purpose of conformed dimensions. The other options are either incomplete or contextually incorrect.