dbt - Advanced Patterns
Which SQL clause is essential in a dbt model to implement incremental loading for SCD Type 2?
Which SQL clause is essential in a dbt model to implement incremental loading for SCD Type 2?
easy🧠 Conceptual Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Identify incremental loading condition
Incremental models use a WHERE clause to filter new or changed rows based on a timestamp.Step 2: Match clause to SCD Type 2 incremental logic
WHERE updated_at > (SELECT MAX(updated_at) FROM target_table) filters rows with updated_at greater than the max in the target, enabling incremental load.Final Answer:
WHERE updated_at > (SELECT MAX(updated_at) FROM target_table) -> Option DQuick Check:
Incremental WHERE clause = WHERE updated_at > (SELECT MAX(updated_at) FROM target_table) [OK]
Quick Trick: Use WHERE with max timestamp for incremental loads [OK]
Common Mistakes:
MISTAKES- Using GROUP BY instead of filtering new rows
- Ordering data without filtering
- Using HAVING without aggregation context
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