mock

11.sql

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+
+with cte as (
+select first_player as "p", first_score as s
+from Matches
+union all
+select second_player as "p", second_score as s
+from Matches
+),
+cte2 as(
+select p1.player_id, p1.group_id, sum(s) as total
+from cte
+join Players p1
+on p1.player_id=cte.p
+group by p1.player_id
+order by total desc, p1.player_id asc)
+select cte2.group_id as GROUP_ID, cte2.player_id as PLAYER_ID
+from cte2
+group by group_id

2.sql

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+with c as (
+select o.item_id,o.seller_id, i.item_brand,RANK() OVER (PARTITION BY seller_id ORDER BY order_date ASC) AS rnk
+from Orders o
+join items i
+on o.item_id=i.item_id
+),
+c2 as (select c.item_brand,c.seller_id
+from c
+where rnk=2)
+select u.user_id as seller_id, 
+case 
+when u.favorite_brand=c2.item_brand then 'yes'
+else 'no'
+end as 2nd_item_fav_brand
+from users u
+left join c2
+on u.user_id=c2.seller_id