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MockSQL2 Interview Solutions #22

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MockSQL2 Interview Solutions #22

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6 changes: 6 additions & 0 deletions customer_bought_all_products
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Original file line number Diff line number Diff line change
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SELECT customer_id
FROM customer c
JOIN product p
ON c.product_key = p.product_key
GROUP BY 1
HAVING COUNT(DISTINCT p.product_key) = (SELECT COUNT(*) FROM product);
14 changes: 14 additions & 0 deletions product_sales_analysis_3
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WITH cte AS(
SELECT product_id,
MIN(year) AS min_year
FROM sales
GROUP BY 1
)
SELECT s.product_id,
s.year AS first_year,
s.quantity,
s.price
FROM sales s
JOIN cte c
ON c.product_id = s.product_id
AND c.min_year = s.year;