From 8825fc7dced9087e7d554fe6549025d4522515a8 Mon Sep 17 00:00:00 2001
From: Feminto <feminto@gmail.com>
Date: Sun, 8 Jun 2025 16:17:16 -0700
Subject: [PATCH 1/2] Adding solution for the mock interview question

---
 Market Analysis II.sql | 60 ++++++++++++++++++++++++++++++++++++++++++
 Tournament Winners.sql | 27 +++++++++++++++++++
 2 files changed, 87 insertions(+)
 create mode 100644 Market Analysis II.sql
 create mode 100644 Tournament Winners.sql

diff --git a/Market Analysis II.sql b/Market Analysis II.sql
new file mode 100644
index 0000000..12401bc
--- /dev/null
+++ b/Market Analysis II.sql	
@@ -0,0 +1,60 @@
+-- Method 1
+WITH cnt AS (
+    SELECT  seller_id,
+            COUNT(*) cnt
+    FROM orders
+    GROUP BY seller_id
+),
+main AS (
+SELECT  user_id AS seller_id,
+        2nd_item_fav_brand,
+        rwn
+FROM (
+    SELECT  u.user_id,
+            -- o.order_date,
+            -- i.item_brand,
+            -- u.favorite_brand,
+            CASE
+                WHEN i.item_brand = u.favorite_brand AND c.cnt > 1 THEN 'yes'
+                ELSE 'no'
+            END AS 2nd_item_fav_brand,
+            ROW_NUMBER() OVER(PARTITION BY u.user_id ORDER BY o.order_date) AS rwn
+    FROM users u
+    LEFT JOIN orders o
+    ON o.seller_id = u.user_id
+    LEFT JOIN items i
+    ON o.item_id = i.item_id
+    LEFT JOIN cnt c
+    ON u.user_id = c.seller_id
+    ORDER BY u.user_id, o.order_date
+    ) a
+WHERE rwn IN (1,2)
+)
+SELECT  seller_id,
+        2nd_item_fav_brand
+FROM main
+WHERE (seller_id, rwn) IN (SELECT seller_id, MAX(rwn) FROM main GROUP BY seller_id);
+
+-- Method 2
+WITH cte AS (
+    SELECT  order_date,
+            item_brand,
+            seller_id,
+            RANK() OVER(PARTITION BY o.seller_id ORDER BY o.order_date) AS 'rnk'
+    FROM orders o
+    JOIN items i
+    ON o.item_id = i.item_id
+),
+cte2 AS (
+    SELECT  *
+    FROM cte 
+    WHERE rnk = 2
+)
+SELECT  user_id AS 'seller_id',
+        CASE
+            WHEN rnk = 2 AND item_brand = favorite_brand THEN 'yes'
+            ELSE 'no'
+        END AS '2nd_item_fav_brand'
+FROM users
+LEFT JOIN cte2
+ON cte2.seller_id = users.user_id;
\ No newline at end of file
diff --git a/Tournament Winners.sql b/Tournament Winners.sql
new file mode 100644
index 0000000..bb3ed18
--- /dev/null
+++ b/Tournament Winners.sql	
@@ -0,0 +1,27 @@
+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  p.group_id,
+            c.player_id,
+            c.score,
+            ROW_NUMBER() OVER(PARTITION BY p.group_id ORDER BY c.score DESC, c.player_id) rwn
+            -- order by score desc first so that we consider the max scored player, and then sorting by player_id ascending so that we capture the lowest player_id in case of a tie.
+    FROM players p
+    JOIN cte c
+    ON p.player_id = c.player_id
+) a
+WHERE rwn = 1;
\ No newline at end of file

From f6b0ccf4754a3cc22745d7267a7e21df35e3c2d2 Mon Sep 17 00:00:00 2001
From: Feminto <feminto@gmail.com>
Date: Sun, 8 Jun 2025 16:19:57 -0700
Subject: [PATCH 2/2] Adding comments at the start of the query

---
 Market Analysis II.sql | 1 +
 Tournament Winners.sql | 1 +
 2 files changed, 2 insertions(+)

diff --git a/Market Analysis II.sql b/Market Analysis II.sql
index 12401bc..245f881 100644
--- a/Market Analysis II.sql	
+++ b/Market Analysis II.sql	
@@ -1,3 +1,4 @@
+-- Solution for Mock SQL 3 question : Market Analysis II
 -- Method 1
 WITH cnt AS (
     SELECT  seller_id,
diff --git a/Tournament Winners.sql b/Tournament Winners.sql
index bb3ed18..6870e34 100644
--- a/Tournament Winners.sql	
+++ b/Tournament Winners.sql	
@@ -1,3 +1,4 @@
+-- Soution for Mock SQL 3 question: Tournament Winners
 WITH cte AS (
     SELECT  player_id,
             SUM(score) AS score