Coach note

Interviewers ask this kind of question to surface how you think, not what you remember. The strongest answers are specific, calmly told, and end on what changed.

SQL · Subqueries

Given an inventory table with warehouse_id, product_id, date, and quantity, write a query that identifies products that were out of stock in at least one warehouse while overstocked (>200% of average) in another on the same date.

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