DA0-002 Data Analysis Practice Question
Which TWO of the following are dimensional modeling techniques commonly used in data warehouses?
⚠ Common exam trap
Candidates often confuse general data modeling concepts (like ERDs) or data visualization tools (like scatter plots and histograms) with specific dimensional modeling techniques used in data warehouses.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Snowflake schema
The snowflake schema is a dimensional modeling technique where dimension tables are normalized into multiple related tables, reducing data redundancy. This structure is commonly used in data warehouses to improve query performance and maintainability for complex analytical queries.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Entity-relationship diagram
Why it's wrong here
Entity-relationship diagrams are used for relational database design, not specifically for dimensional modeling.
- ✓
Snowflake schema
Why this is correct
Snowflake schema is a dimensional modeling technique where dimensions are normalized.
- ✓
Star schema
Why this is correct
Star schema is a dimensional modeling technique with a central fact table and dimension tables.
- ✗
Scatter plot
Why it's wrong here
Scatter plot is a chart for visualizing relationships, not a data modeling technique.
- ✗
Histogram
Why it's wrong here
Histogram is a chart for data distribution, not a data modeling technique.
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