Mock 3 PR

MarketAnalysis2.sql

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+WITH RankedSales AS (
+    SELECT 
+        o.seller_id,
+        o.order_date,
+        i.item_brand,
+        ROW_NUMBER() OVER (PARTITION BY o.seller_id ORDER BY o.order_date) AS sale_rank
+    FROM Orders o
+    JOIN Items i ON o.item_id = i.item_id
+),
+SecondSales AS (
+    SELECT 
+        rs.seller_id,
+        rs.item_brand
+    FROM RankedSales rs
+    WHERE rs.sale_rank = 2
+)
+SELECT 
+    u.user_id AS seller_id,
+    CASE 
+        WHEN ss.item_brand = u.favorite_brand THEN 'yes'
+        ELSE 'no'
+    END AS 2nd_item_fav_brand
+FROM Users u
+LEFT JOIN SecondSales ss ON u.user_id = ss.seller_id;
+PRINT 'Ranked Sales CTE started';
+WITH RankedSales AS (
+    SELECT 
+        o.seller_id,
+        o.order_date,
+        i.item_brand,
+        ROW_NUMBER() OVER (PARTITION BY o.seller_id ORDER BY o.order_date) AS sale_rank
+    FROM Orders o
+    JOIN Items i ON o.item_id = i.item_id
+)
+PRINT 'Ranked Sales CTE completed';
+PRINT 'Second Sales CTE started';
+SecondSales AS (
+    SELECT 
+        rs.seller_id,
+        rs.item_brand
+    FROM RankedSales rs
+    WHERE rs.sale_rank = 2
+)
+PRINT 'Second Sales CTE completed';
+PRINT 'Final query started';
+SELECT 
+    u.user_id AS seller_id,
+    CASE 
+        WHEN ss.item_brand = u.favorite_brand THEN 'yes'
+        ELSE 'no'
+    END AS 2nd_item_fav_brand
+FROM Users u
+LEFT JOIN SecondSales ss ON u.user_id = ss.seller_id;
+PRINT 'Final query completed';

TournamentWinners.sql

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+WITH PlayerScores AS (
+    SELECT 
+        first_player AS player_id,
+        SUM(first_score) AS total_score
+    FROM Matches
+    GROUP BY first_player
+
+    UNION ALL
+
+    SELECT 
+        second_player AS player_id,
+        SUM(second_score) AS total_score
+    FROM Matches
+    GROUP BY second_player
+),
+TotalScores AS (
+    SELECT 
+        p.group_id,
+        ps.player_id,
+        SUM(ps.total_score) AS group_score
+    FROM PlayerScores ps
+    JOIN Players p
+    ON ps.player_id = p.player_id
+    GROUP BY p.group_id, ps.player_id
+),
+MaxScores AS (
+    SELECT 
+        group_id,
+        MAX(group_score) AS max_score
+    FROM TotalScores
+    GROUP BY group_id
+)
+SELECT 
+    ts.group_id,
+    ts.player_id
+FROM TotalScores ts
+JOIN MaxScores ms
+ON ts.group_id = ms.group_id AND ts.group_score = ms.max_score
+WHERE ts.player_id = (
+    SELECT MIN(player_id)
+    FROM TotalScores ts2
+    WHERE ts2.group_id = ts.group_id AND ts2.group_score = ts.group_score
+)
+ORDER BY ts.group_id;