Completed Sql6

CombineTwoTables.sql

@@ -0,0 +1,7 @@
+'''
+4 Problem 4 : Combine Two Tables (https://leetcode.com/problems/combine-two-tables/)
+'''
+
+SELECT firstName, lastName, city, state
+FROM Person
+LEFT JOIN Address ON Address.personId = Person.personId

CustomersWithStrictlyIncreasingPurchases.sql

@@ -0,0 +1,15 @@
+'''
+5 Problem 5 : Customers with Strictly Increasing Purchases (https://leetcode.com/problems/customers-with-strictly-increasing-purchases/)
+'''
+
+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    

GamePlayAnalysisII.sql

@@ -0,0 +1,14 @@
+'''
+Sql6
+
+1 Problem 1 : Game Play Analysis II (https://leetcode.com/problems/game-play-analysis-ii/)
+
+'''
+
+SELECT player_id, device_id
+FROM Activity
+WHERE (player_id, event_date) IN (
+    SELECT player_id, MIN(event_date)
+    FROM Activity
+    GROUP BY player_id
+)

GamePlayAnalysisIII.sql

@@ -0,0 +1,6 @@
+'''
+2 Problem 2 : Game Play Analysis III (https://leetcode.com/problems/game-play-analysis-iii/)
+'''
+
+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

@@ -0,0 +1,7 @@
+'''
+3 Problem 3 : Shortest Distance in a Plane (https://leetcode.com/problems/shortest-distance-in-a-plane/)
+'''
+
+SELECT ROUND(SQRT(MIN(POWER(p1.x - p2.x, 2) + POWER(p1.y - p2.y, 2))), 2) AS shortest
+FROM Point2D p1, Point2D p2
+WHERE (p1.x, p1.y) <> (p2.x, p2.y)