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What does the dbt_utils.unique_combination_of_columns test check in a dbt model?

easy📝 Conceptual Q1 of 15
dbt - Advanced Testing
What does the dbt_utils.unique_combination_of_columns test check in a dbt model?
AIt ensures that the columns contain no NULL values.
BIt verifies that each column individually contains unique values.
CIt checks that the combination of specified columns has unique values across all rows.
DIt validates that the columns have consistent data types.
Step-by-Step Solution
Solution:

  1. Step 1: Understand the test purpose

    The unique_combination_of_columns test checks uniqueness across multiple columns combined, not individually.

  2. Step 2: Differentiate from other tests

    Other tests like unique check single columns, and not_null checks for NULLs, so they don't match this test.

  3. Final Answer:

    It checks that the combination of specified columns has unique values across all rows. -> Option C

  4. Quick Check:

    Test purpose = Unique combination [OK]
Quick Trick: Unique combination means all columns together must be unique [OK]
Common Mistakes:
MISTAKES
  • Confusing unique combination with unique single column
  • Thinking it checks for NULL values
  • Assuming it checks data types

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