SQL6 DONE

combinetwotables.sql

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+SELECT
+  Person.firstName,
+  Person.lastName,
+  Address.city,
+  Address.state
+FROM Person
+LEFT JOIN Address
+  USING (personId);
+
+

customerwithincrease.sql

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+select
+    customer_id
+from
+    (
+        select
+            customer_id,
+            year(order_date),
+            sum(price) as total,
+            year(order_date) - rank() over(
+                partition by customer_id
+                order by
+                    sum(price)
+            ) as rk
+        from
+            Orders
+        group by
+            customer_id,
+            year(order_date)
+    ) t
+group by
+    customer_id
+having
+    count(distinct rk) = 1;

gameplayanalysis2.sql

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+# Write your MySQL query statement below
+SELECT
+    player_id,
+    device_id
+FROM Activity
+WHERE
+    (player_id, event_date) IN (
+        SELECT
+            player_id,
+            MIN(event_date) AS event_date
+        FROM Activity
+        GROUP BY 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;

shortestdistance.sql

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+SELECT
+    ROUND(
+        SQRT(
+            MIN(POW(a.x-b.x,2) + POW(a.y-b.y,2))
+        )
+        ,2
+    ) shortest
+FROM point_2d a 
+CROSS JOIN point_2d b
+WHERE NOT (a.x = b.x AND a.y = b.y)
+
+
+SELECT ROUND(SQRT(POW(p1.x - p2.x, 2) + POW(p1.y - p2.y, 2)), 2) AS shortest
+FROM
+    Point2D AS p1
+    JOIN Point2D AS p2 ON p1.x != p2.x OR p1.y != p2.y
+ORDER BY 1
+LIMIT 1;