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An incremental model fails with a duplicate key error during run. What is the best fix?

medium📝 Debug Q7 of 15
dbt - Incremental Models
An incremental model fails with a duplicate key error during run. What is the best fix?
AChange materialization to 'view'
BAdd a unique key filter or deduplicate data in the incremental query
CRemove the incremental filter condition
DRun a full-refresh every time
Step-by-Step Solution
Solution:

  1. Step 1: Understand cause of duplicate key error

    Duplicates occur when incremental inserts contain repeated keys violating uniqueness.

  2. Step 2: Apply deduplication or unique filtering

    Fix by ensuring incremental query returns unique keys or deduplicated data.

  3. Final Answer:

    Add a unique key filter or deduplicate data in the incremental query -> Option B

  4. Quick Check:

    Deduplicate incremental data to avoid key errors [OK]
Quick Trick: Ensure unique keys in incremental inserts [OK]
Common Mistakes:
MISTAKES
  • Switching to view materialization incorrectly
  • Removing filters causing duplicates
  • Relying on full-refresh as only fix

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