Completed MockSQL3

Problem1_TournamentWinners.sql

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+# Write your MySQL query statement below
+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
+ ) A
+ group by player_id)
+
+select group_id,player_id
+from 
+( select distinct p.group_id, c.player_id, 
+score,
+dense_rank() over (partition by p.group_id order by c.score desc, c. player_id ) as rnk
+from players p
+left join cte c on p.player_id=c.player_id) A
+where rnk=1;

Problem2_MarketAnalysis2.sql

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+# Write your MySQL query statement below
+with cte as (
+select  order_date, seller_id ,
+dense_rank() over(partition by seller_id order by order_date) as rnk,
+i.item_brand
+from Orders o 
+left join items i on o.item_id=i.item_id
+order by seller_id, order_date)
+
+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 cte c on c.seller_id=u.user_id and c.rnk = 2