Your question is Handling Nulls Before Analysis. 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).
Explain how you would handle missing or NULL values in a PostgreSQL dataset before starting analysis. Focus on a practical workflow: identify missingness, decide whether to keep, filter, or replace NULLs, and explain how simple SQL tools support those choices.
COALESCE and CASE WHEN appropriately