solution to both problems

01-MarketAnalysis-II.sql

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+-- Problem 1: Market Analysis II (https://leetcode.com/problems/market-analysis-ii/)
+
+with cte as(
+select seller_id, item_id, item_brand from (
+select seller_id, o.item_id as item_id, item_brand, order_date, rank() over (partition by seller_id order by order_date) as rnk
+from orders o
+join items i on o.item_id = i.item_id) as temp
+where rnk = 2)
+
+
+select user_id as seller_id,  
+(case 
+when  item_brand = favorite_brand then 'yes'
+else 'no'
+end) as '2nd_item_fav_brand'
+from users 
+left join cte on users.user_id = cte.seller_id
+
+
+
+
+
+
+

02-TournamentWinners.sql

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+-- Problem 2: Tournament Winners: https://leetcode.com/problems/tournament-winners/description/
+
+
+with cte as (
+select player_id, sum(score) as score from (
+select first_player as player_id , first_score as score
+from matches 
+union all
+select second_player as player_id , second_score as score
+from matches 
+) as temp
+group by player_id),
+cte2 as(
+select group_id, cte.player_id, score, rank() over (partition by group_id order by score desc, player_id asc) as rnk
+from cte
+join players on cte.player_id=players.player_id)
+
+select group_id, player_id
+from cte2
+where rnk = 1
+
+
+
+
+