Done PR6

Combine Two Tables.sql

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+
+SELECT p.firstName,p.lastName,a.city,a.state
+FROM
+Person p LEFT JOIN Address a
+ON p.personId = a.personId

Customers with Strictly Increasing Purchases.sql

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+
+WITH CTE AS (
+    SELECT customer_id, YEAR(order_date) AS 'year', SUM(price) AS price_m
+    FROM Orders GROUP BY year,customer_id
+    ORDER BY customer_id
+)
+
+-- SELECT * FROM CTE
+
+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.price_m < c2.price_m)
+GROUP BY c1.customer_id HAVING COUNT(*) - COUNT(c2.customer_id) =1

Game Play Analysis II.sql

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+# Write your MySQL query statement below
+-- SELECT DISTINCT player_id, FIRST_VALUE(device_id) OVER (PARTITION BY player_id  ORDER BY event_date) AS device_id FROM
+-- Activity
+-- method2
+-- SELECT a.player_id, a.device_id
+-- FROM Activity a
+-- WHERE a.event_date IN (SELECT MIN(b.event_date) FROM 
+-- Activity b WHERE a.player_id = b.player_id)
+
+WITH CTE AS(
+    SELECT player_id, device_id, RANK() OVER(PARTITION BY player_id ORDER BY event_date) AS 'rnk'
+    FROM Activity
+)
+
+SELECT c.player_id , c.device_id FROM CTE c
+WHERE c.rnk = '1'
+
+
+
+
+

Game Play Analysis III.sql

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+
+SELECT player_id, event_date, SUM(games_played) OVER(PARTITION BY player_id ORDER BY event_date) AS games_played_so_far
+FROM Activity 
+
+-- SELECT a1.player_id, a1.event_date, (SELECT SUM(a2.games_played) FROM Activity a2 WHERE 
+-- a1.player_id = a2.player_id AND a1.event_date >= a2.event_date) AS games_played_so_far
+
+-- FROM Activity a1

Shortest Distance in a Plane.sql

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+
+-- WITH CTE AS (
+--     SELECT p1.x AS x1, p1.y AS y1 ,p2.x AS x2, p2.y AS y2, ROUND(SQRT( POW(p2.x-p1.x,2) + POW(p2.y-p1.y,2) ),2) AS 'dist'
+--     FROM Point2D p1
+--     CROSS JOIN
+--     Point2D p2
+-- )
+
+
+-- SELECT MIN(dist) AS shortest
+-- FROM CTE
+-- WHERE x1!=x2 OR y1!=y2
+
+SELECT MIN(ROUND(SQRT(POW(p2.x - p1.x , 2) + POW(p2.y - p1.y, 2)),2)) AS 'shortest' 
+FROM point2D p1 
+INNER JOIN point2D p2 
+ON 
+    (p1.x <= p2.x AND p1.y < p2.y) OR
+    (p1.x <= p2.x AND p1.y > p2.y) OR
+    (p1.x > p2.x AND p1.y = p2.y);