Products With Price Increase

Problem

Return product and changed_on for rows where price increased from the previous price for that product.

Why This Matters

SQL interviews usually test whether you can turn a business question into the right rows, grouping level, join type, and edge-case behavior.

Schema

price_history(product TEXT, changed_on TEXT, price INTEGER)

Examples

Constraints

• Return only the requested columns.
• Use deterministic ORDER BY when multiple rows are returned.
• Assume SQLite-compatible SQL unless the prompt states otherwise.