Done

Problem 2 Game Play Analysis 3.sql

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+# Write your MySQL query statement below
+SELECT player_id, event_date, SUM(games_played) OVER (PARTITION BY  player_id ORDER BY player_id, event_date ) AS 'games_played_so_far' FROM Activity

Problem 3 Shortest Distance in a Plane.sql

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+# Write your MySQL query statement below
+SELECT 
+     ROUND(SQRT(MIN(POW(p1.x - p2.x, 2) + POW(p1.y - p2.y, 2))),2) AS 'shortest'
+FROM 
+    Point2D p1
+INNER JOIN 
+    Point2D p2
+    WHERE p1.x<>p2.x OR p1.y <>p2.y;

Problem 4 Combile two tables.sql

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+# Write your MySQL query statement below
+SELECT firstName, lastName, city, state FROM Person 
+LEFT JOIN Address
+ON Person.personId = Address.PersonId

Problem 5 Customers with strictly Increasing Purchases.sql

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+# Write your MySQL query statement below
+WITH CTE AS (
+    SELECT customer_id, YEAR(order_date) AS Year, SUM(price) AS TotalPurchase
+    FROM orders
+    GROUP BY customer_id, Year
+)
+SELECT c1.customer_id
+FROM CTE c1
+LEFT JOIN CTE c2
+ON c1.customer_id = c2.customer_id
+   AND c1.Year + 1 = c2.Year
+   AND c1.TotalPurchase < c2.TotalPurchase
+GROUP BY c1.customer_id
+HAVING (COUNT(*)- COUNT(c2.customer_id))=1

Problem1 Game Play Analysis 2.sql

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+# Write your MySQL query statement below
+WITH CTE AS(
+    SELECT player_id, device_id, event_date, rank() OVER (PARTITION BY player_id ORDER BY event_date) AS 'rnk' FROM Activity)
+
+    SELECT player_id, device_id FROM CTE
+    WHERE rnk = 1