Completed Mock-SQL-3

MarketAnalysisII.sql

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+'''
+https://leetcode.com/problems/market-analysis-ii/description/
+'''
+
+WITH CTE AS (
+    SELECT seller_id, item_id, RANK() OVER(PARTITION BY seller_id ORDER BY order_date) AS rnk 
+    from Orders
+),
+ACTE AS (
+    SELECT CTE.seller_id, Items.item_brand 
+    FROM CTE
+    JOIN Items ON CTE.item_id = Items.item_id 
+    WHERE rnk = 2
+)
+SELECT Users.user_id AS seller_id, IF(Users.favorite_brand = ACTE.item_brand, 'yes', 'no') AS 2nd_item_fav_brand
+FROM Users
+LEFT JOIN ACTE ON Users.user_id = ACTE.seller_id

TournamentWinners.sql

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+'''
+https://leetcode.com/problems/tournament-winners/description/
+'''
+
+SELECT group_id, player_id FROM (SELECT p.player_id, p.group_id, RANK() OVER(PARTITION BY p.group_id ORDER BY 
+    SUM(CASE 
+            WHEN p.player_id = m.first_player THEN m.first_score ELSE second_score
+        END)DESC, p.player_id ASC) AS rnk 
+FROM Players p 
+JOIN Matches m ON p.player_id IN (m.first_player, m.second_player)
+GROUP BY p.player_id, p.group_id) AS intermediate
+WHERE rnk = 1