dbt - Incremental Models
In a dbt merge config, the unique_key is set as unique_key: 'id'. The merge fails with an error about duplicate keys. What is the likely cause?
In a dbt merge config, the unique_key is set as unique_key: 'id'. The merge fails with an error about duplicate keys. What is the likely cause?
medium📝 Debug Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze error cause
Duplicate key errors usually mean source data has repeated values in the unique_key column.Step 2: Check other options
Missing target column or config syntax errors cause different errors, not duplicate key errors.Final Answer:
The source data contains duplicate values in the 'id' column -> Option AQuick Check:
Duplicate keys in source cause merge failure [OK]
Quick Trick: Check source data for duplicates if merge fails on unique_key [OK]
Common Mistakes:
MISTAKES- Assuming syntax error causes duplicate key error
- Thinking missing target column causes duplicate key error
- Confusing unique_key format with error cause
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