PR #29, 30: Radhika

market_analysis_II.sql

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+# Write your MySQL query statement below
+WITH CTE AS(
+    SELECT seller_id, order_date, item_id,
+    RANK() OVER (PARTITION BY seller_id ORDER BY order_date) AS 'rnk'
+    FROM Orders
+),
+ACTE AS(
+    SELECT c.seller_id, c.item_id, i.item_brand FROM CTE c LEFT JOIN Items i USING (item_id) WHERE c.rnk = 2
+)
+
+SELECT u.user_id AS 'seller_id', (
+    CASE
+    WHEN u.favorite_brand = a.item_brand THEN 'yes'
+    ELSE 'no'
+    END
+) AS '2nd_item_fav_brand' FROM Users u LEFT JOIN ACTE a ON u.user_id = a.seller_id

tournament_winners_sql

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+# Write your MySQL query statement below
+WITH CTE AS(
+    SELECT m1.first_player AS 'player_id', m1.first_score AS 'score' FROM Matches m1
+    UNION ALL
+    SELECT m2.second_player AS 'player_id', m2.second_score AS 'score' FROM Matches m2
+),
+ACTE AS(
+    SELECT c.player_id, p.group_id, SUM(c.score) AS 'total' 
+    FROM CTE c JOIN Players p USING(player_id) GROUP BY c.player_id)
+
+SELECT DISTINCT a.group_id, FIRST_VALUE(a.player_id) OVER 
+(PARTITION BY a.group_id ORDER BY a.total DESC, a.player_id) AS 'player_id' FROM ACTE a