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commit #16

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2 changes: 2 additions & 0 deletions customers_who_bought.sql
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select customer_id from customer group by customer_id having count (distinct
product_key) = (select count(product_key) FROM product);
3 changes: 3 additions & 0 deletions product_sales_analysis.sql
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select product_id, year as first_year, quanitity, price from sales where
(product_id, year) in (select product_id, min year) as year from sales
GROUP BY product_id;