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To detect if a user has conflicting 'region' values across multiple records in dbt, which advanced testing method is most effective?

hard📝 Application Q8 of 15
dbt - Advanced Testing
To detect if a user has conflicting 'region' values across multiple records in dbt, which advanced testing method is most effective?
ACheck if any region value is NULL for each user_id
BWrite a test that groups by user_id and counts distinct region values, flagging counts > 1
CVerify that all region values match a predefined list without grouping
DRun a test that ensures region values are always uppercase
Step-by-Step Solution
Solution:

  1. Step 1: Understand the problem

    Conflicting regions mean multiple distinct values per user.

  2. Step 2: Choose test approach

    Grouping by user_id and counting distinct regions identifies conflicts.

  3. Final Answer:

    Write a test that groups by user_id and counts distinct region values, flagging counts > 1 -> Option B

  4. Quick Check:

    Distinct count > 1 detects inconsistent values [OK]
Quick Trick: Count distinct values per user to find conflicts [OK]
Common Mistakes:
MISTAKES
  • Only checking for NULLs misses conflicts
  • Not grouping by user_id loses context
  • Checking case sensitivity unrelated to conflicts

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