dbt - Incremental Models
Why might the merge incremental strategy in dbt be preferred over append when working with slowly changing dimensions?
Why might the merge incremental strategy in dbt be preferred over append when working with slowly changing dimensions?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand slowly changing dimensions (SCD)
SCDs require updating existing rows to reflect changes over time.Step 2: Compare append and merge
Append only adds new rows, merge updates existing rows preserving data accuracy.Final Answer:
Because merge can update existing rows, preserving historical data accuracy -> Option CQuick Check:
Merge updates existing rows, ideal for SCDs [OK]
Quick Trick: Use merge to update existing rows for slowly changing data [OK]
Common Mistakes:
MISTAKES- Assuming append updates rows
- Thinking merge deletes all data
- Believing append supports deletes
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