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Can you provide a use case where Assert Transformations helped maintain data quality?

SQLeasy0.3 min readPremium
Frequency
Low
Asked at 1 company
Category
487
questions in SQL
Difficulty Split
130E|271M|86H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Virtusa
Key Concepts Tested
etl
Expert AnswerPremium
60 wordsInterview-ready
**Use Case:** ETL loading customer data. Assert: email NOT NULL, email regex, age 0–120. Fail pipeline if any row violates. Prevents bad data in warehouse. **Tools:** dbt tests (unique, not_null, relationships). Great Expectations. Assert early; actionable messages. Separate assertion step for debugging. **Result:** Caught 500 invalid emails in first run; fixed source system....
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