Completed Sql6

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' from orders GROUP BY year , customer_id 
+order 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.price < c2.price GROUP BY c1.customer_id 
+HAVING COUNT(*) - COUNT(c2.customer_id) = 1;

Game Play Analysis II.sql

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+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)

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

Shortest Distance in a Plane.sql

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+SELECT ROUND(MIN(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 OR p1.y != p2.y