diff --git a/Combine_Two_Tables.sql b/Combine_Two_Tables.sql
new file mode 100644
index 0000000..d802252
--- /dev/null
+++ b/Combine_Two_Tables.sql
@@ -0,0 +1,2 @@
+SELECT p.firstName, p.lastName, a.city, a.state FROM Person p
+LEFT JOIN Address a ON p.personId = a.personId;
diff --git a/Game_play_analysis_III.sql b/Game_play_analysis_III.sql
new file mode 100644
index 0000000..897f24a
--- /dev/null
+++ b/Game_play_analysis_III.sql
@@ -0,0 +1,2 @@
+SELECT player_id, event_date, SUM(games_played) OVER(partition by player_id ORDER BY event_date) 
+AS 'games_played_so_far' FROM Activity;
\ No newline at end of file
diff --git a/customers_with_strictly_increasing.sql b/customers_with_strictly_increasing.sql
new file mode 100644
index 0000000..dd105a1
--- /dev/null
+++ b/customers_with_strictly_increasing.sql
@@ -0,0 +1,8 @@
+WITH CTE AS (
+SELECT customer_id, substr(order_date,1,4) as o_date, sum(price) as total FROM Orders
+Group by substr(order_date,1,4), customer_id
+)
+
+SELECT a.customer_id FROM CTE a LEFT JOIN CTE b ON a.customer_id = b.customer_id and a.o_date + 1 = b.o_date and a.total < b.total
+Group by a.customer_id
+Having count(distinct b.o_date) = max(a.o_date) - min(a.o_date)
diff --git a/gmae_play_analysis_ii.sql b/gmae_play_analysis_ii.sql
new file mode 100644
index 0000000..84b3f03
--- /dev/null
+++ b/gmae_play_analysis_ii.sql
@@ -0,0 +1,2 @@
+SELECT DISTINCT player_id, FIRST_VALUE(device_id) OVER(PARTITION BY player_id 
+ORDER BY event_date) AS device_id FROM Activity;
\ No newline at end of file
diff --git a/shortest_distance_in_a_plane.sql b/shortest_distance_in_a_plane.sql
new file mode 100644
index 0000000..e2ab506
--- /dev/null
+++ b/shortest_distance_in_a_plane.sql
@@ -0,0 +1,2 @@
+SELECT ROUND(SQRT(MIN(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;