Your question is Basic SQL Data Validation Checks. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Teams often use SQL as a first pass to validate raw data before reporting, modeling, or downstream processing. Interviewers ask this to see whether you can identify common data quality issues with simple, reliable queries.
Explain how you would perform basic database validation using SQL. Your answer should cover:
NULL values in important columnsKeep the discussion practical and focused on easy SQL techniques. The interviewer is not looking for a full data quality framework; they want to hear how you would use straightforward SELECT, WHERE, GROUP BY, and aggregate queries to catch common issues quickly.