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mock sql 3 #10

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20 changes: 20 additions & 0 deletions mock_sql.sql
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Original file line number Diff line number Diff line change
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WITH CTE AS(
SELECT o.seller_id,
o.item_id,
i.item_brand,
DENSE_RANK() OVER( PARTITION BY o.seller_id ORDER BY o.order_date) AS rnk
FROM Orders o
JOIN
Items i
ON o.item_id = i.item_id
)
SELECT u.user_id as 'seller_id',
CASE
WHEN c.item_brand = u.favorite_brand THEN 'yes'
ELSE 'no'
END as 2nd_item_fav_brand
FROM Users as u
LEFT JOIN
CTE as c
ON c.seller_id = u.user_id AND c.rnk = 2;
-- SELECT * FROM CTE;