<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Write a SQL query to summarize the sales of each product.
Table: Sales
Columns: product, quantity<|im_end|>
<|im_start|>assistant
SELECT product, SUM(quantity) AS total_sales
FROM Sales
GROUP BY product;<|im_end|>
