Completed Mock_SQL

Mock 1.sql

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+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
+

Mock 2.sql

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+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