diff --git a/problem1-512-game-play-analysis2.sql b/problem1-512-game-play-analysis2.sql
new file mode 100644
index 0000000..61c3162
--- /dev/null
+++ b/problem1-512-game-play-analysis2.sql
@@ -0,0 +1,18 @@
+with row_num_based_user_activity as (
+    select
+        player_id,
+        device_id,
+        row_number() over (
+            partition by player_id
+            order by event_date
+        ) as rnk
+    from activity
+)
+
+select
+    player_id,
+    device_id
+from
+    row_num_based_user_activity
+where
+    rnk = 1
\ No newline at end of file
diff --git a/problem2-534-game-play-analysis3.sql b/problem2-534-game-play-analysis3.sql
new file mode 100644
index 0000000..e743b0a
--- /dev/null
+++ b/problem2-534-game-play-analysis3.sql
@@ -0,0 +1,12 @@
+select
+    player_id,
+    event_date,
+    sum(games_played)
+        over (
+            partition by player_id
+            order by event_date
+        )
+        as games_played_so_far
+from
+    activity
+order by player_id, event_date
\ No newline at end of file
diff --git a/problem3-612-shortestt-distance-plane.sql b/problem3-612-shortestt-distance-plane.sql
new file mode 100644
index 0000000..f688592
--- /dev/null
+++ b/problem3-612-shortestt-distance-plane.sql
@@ -0,0 +1,8 @@
+select
+    round(min(sqrt(power(p2.x - p1.x, 2) + power(p2.y - p1.y, 2))), 2)
+        as shortest
+from
+    point2d as p1
+inner join
+    point2d as p2
+    on (p1.x, p1.y) < (p2.x, p2.y)
\ No newline at end of file
diff --git a/problem4-175-combine-two-tables.sql b/problem4-175-combine-two-tables.sql
new file mode 100644
index 0000000..1b3e4fa
--- /dev/null
+++ b/problem4-175-combine-two-tables.sql
@@ -0,0 +1,11 @@
+select
+    FIRSTNAME,
+    LASTNAME,
+    CITY,
+    STATE
+from
+    PERSON
+left join
+    ADDRESS
+    on
+      PERSON.PERSONID = ADDRESS.PERSONID
\ No newline at end of file
diff --git a/problem5-2474-customers-with-strictly-increase-purchase.sql b/problem5-2474-customers-with-strictly-increase-purchase.sql
new file mode 100644
index 0000000..c91df3a
--- /dev/null
+++ b/problem5-2474-customers-with-strictly-increase-purchase.sql
@@ -0,0 +1,25 @@
+with cte_customer_yoy_purchase as (
+    select
+        customer_id,
+        YEAR(order_date) as order_year,
+        SUM(price) as total_price
+    from
+        orders
+    group by
+        customer_id,
+        YEAR(order_date)
+    order by
+        customer_id
+)
+
+select cyoy.customer_id
+from
+    cte_customer_yoy_purchase as cyoy
+left join
+    cte_customer_yoy_purchase as cyoy1
+    on
+        cyoy.customer_id = cyoy1.customer_id
+        and cyoy.order_year + 1 = cyoy1.order_year
+        and cyoy.total_price < cyoy1.total_price
+group by cyoy.customer_id
+having COUNT(*) - COUNT(cyoy1.customer_id) = 1