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What does SCD Type 2 primarily help track in a data warehouse?

easy🧠 Conceptual Q1 of 15
dbt - Advanced Patterns
What does SCD Type 2 primarily help track in a data warehouse?
AHistorical changes of data over time
BOnly the latest data without history
CData aggregation for summaries
DReal-time streaming data
Step-by-Step Solution
Solution:

  1. Step 1: Understand SCD Type 2 purpose and compare options

    SCD Type 2 is designed to keep all historical versions of data when changes occur. Only Historical changes of data over time mentions tracking historical changes, which matches SCD Type 2's goal.

  2. Final Answer:

    Historical changes of data over time -> Option A

  3. Quick Check:

    SCD Type 2 = Historical tracking [OK]
Quick Trick: SCD Type 2 keeps history, not just current data [OK]
Common Mistakes:
MISTAKES
  • Confusing SCD Type 2 with Type 1
  • Thinking it only stores latest data
  • Mixing with real-time data concepts

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