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 · Window functions

Given a prices table with product_id, effective_date, and price, write a query that returns each product's price history with the percent change from its previous price.

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Given a prices table with product_id, effective_date, and price, write a query that returns each product's price history with the percent change from its previous price.

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