SQL 6 PR

CombineTwoTables.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;

CustomersWithStrictlyIncreasingPurchases.sql

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+WITH CTE AS (
+    SELECT customer_id, 
+           YEAR(order_date) AS order_year, 
+           SUM(price) AS total
+    FROM Orders
+    GROUP BY customer_id, YEAR(order_date)
+),
+Ranked AS (
+    SELECT customer_id,
+           order_year,
+           ROW_NUMBER() OVER(PARTITION BY customer_id ORDER BY order_year) AS rank_year,
+           DENSE_RANK() OVER(PARTITION BY customer_id ORDER BY total) AS rank_total
+    FROM CTE
+)
+SELECT customer_id
+FROM Ranked
+GROUP BY customer_id
+HAVING COUNT(CASE WHEN rank_year = rank_total THEN 1 END) = MAX(order_year) - MIN(order_year) + 1;

GamePlayAnalysis2.sql

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+SELECT a.player_id, a.device_id 
+FROM (
+    SELECT b.player_id, b.device_id, b.event_date, 
+           RANK() OVER(PARTITION BY b.player_id ORDER BY b.event_date) AS 'rnk' 
+    FROM Activity b
+) a 
+WHERE a.rnk = 1;

GamePlayAnalysis3.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;

ShortestDistanceInAPlane.sql

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+SELECT ROUND(SQRT(MIN(POW(p2.x - p1.x, 2) + POW(p2.y - p1.y, 2))), 2) AS 'shortest'
+FROM Point2D p1
+JOIN Point2D p2
+ON NOT (p1.x = p2.x AND p1.y = p2.y);