MockSQL3 Submitted

Problem1.sql

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+WITH CTE AS (
+    SELECT 
+        o.seller_id,
+        i.item_brand,
+        u.favorite_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
+    JOIN users u ON o.seller_id = u.user_id
+),
+CTE2 AS (
+    SELECT 
+        seller_id,
+        item_brand,
+        favorite_brand
+    FROM CTE
+    WHERE rnk = 2
+)
+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 u
+LEFT JOIN CTE2 c ON u.user_id = c.seller_id;

Problem2.sql

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+WITH CTE AS(
+Select first_player as player, first_score as score from Matches
+UNION all
+Select second_player as player, second_score as score from Matches
+),
+CTE2 as(
+Select distinct player, SUM(score) OVER (partition by player) as 'sum' from CTE 
+),
+CTE3 as(
+SELECT p.group_id,c.player, c.sum, DENSE_RANK()OVER(partition by p.group_id order by sum desc, c.player asc) as 'rnk' from CTE2 c  JOIN Players p ON c.player = p.player_id
+order by group_id)
+
+
+Select group_id, player  as 'player_id' from CTE3  where rnk = 1
+order by group_id