Welcome to your interview.
The question is on your right: Handling Nulls in Dashboard Metrics. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
Explain how you handle NULL values in SQL-backed visualizations without changing the meaning of the data. Focus on when to preserve missing values, when to replace them, and how aggregate functions behave in PostgreSQL.
NULL semanticsCOALESCECOUNT(*), COUNT(column), AVG(), and SUM()CASE WHEN to expose missingness in dashboard outputsIn a Synechron visualization workflow, the interviewer is looking for practical SQL judgment: can you make a chart readable without converting missing data into false business signals?