diff --git a/Mock 1.sql b/Mock 1.sql
new file mode 100644
index 0000000..26007be
--- /dev/null
+++ b/Mock 1.sql	
@@ -0,0 +1,5 @@
+WITH CTE AS (
+    SELECT user_id, SUM(distance) OVER(PARTITION BY user_id) AS travelled_distance FROM Rides
+)
+SELECT DISTINCT u.name, IFNULL(CTE.travelled_distance, 0) AS travelled_distance FROM Users u LEFT JOIN CTE ON u.id=CTE.user_id ORDER BY CTE.travelled_distance DESC, u.name
+
diff --git a/Mock 2.sql b/Mock 2.sql
new file mode 100644
index 0000000..dd27a80
--- /dev/null
+++ b/Mock 2.sql	
@@ -0,0 +1,9 @@
+WITH CTE AS (
+    SELECT sale_date, (
+        CASE
+        WHEN fruit='apples' THEN sold_num
+        ELSE -sold_num
+        end
+    ) AS sold_num FROM Sales
+)
+SELECT sale_date, SUM(sold_num) AS diff FROM CTE GROUP BY sale_date ORDER BY sale_date
\ No newline at end of file