dbt - Advanced Patterns
A dbt model for SCD Type 2 is not updating the end_date correctly. Which fix is most appropriate?
A dbt model for SCD Type 2 is not updating the end_date correctly. Which fix is most appropriate?
medium📝 Debug Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Identify correct SCD Type 2 update process and evaluate fixes
Old records must have their end_date set to expire them before new versions insert. Add a step to update end_date of old records before inserting new ones adds this necessary step; others break history or data integrity.Final Answer:
Add a step to update end_date of old records before inserting new ones -> Option BQuick Check:
Expire old records before new insert [OK]
Quick Trick: Expire old records by updating end_date first [OK]
Common Mistakes:
MISTAKES- Deleting data instead of updating
- Removing effective_date
- Setting end_date NULL incorrectly
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