Done SQL 6

Combine_Two_Tables.sql

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+select FirstName, LastName, City, State
+from Person left join Address
+on Person.PersonId = Address.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 A1.player_id, A1.device_id
+FROM Activity A1
+WHERE (A1.player_id, A1.event_date) IN (
+SELECT A2.player_id, MIN(A2.event_date)
+FROM Activity A2 GROUP BY A2.player_id );

Game_Play_Analysis _III.sql

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+SELECT A.player_id, A.event_date,
+SUM(A.games_played) OVER ( PARTITION BY A.player_id ORDER BY A.event_date ) AS games_played_so_far
+FROM Activity A;

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
+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) ;