Completed Mock_SQL1

Problem1.sql

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+SELECT 
+  users.name, 
+  IFNULL(SUM(rides.distance), 0) AS travelled_distance 
+FROM Users
+LEFT JOIN Rides ON users.id = rides.user_id
+GROUP BY users.id, users.name
+ORDER BY travelled_distance DESC, users.name ASC;

Problem2.sql

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+WITH CTE_apples AS (
+    SELECT sale_date, sold_num 
+    FROM Sales 
+    WHERE fruit = 'apples'
+),
+CTE_oranges AS (
+    SELECT sale_date, sold_num 
+    FROM Sales 
+    WHERE fruit = 'oranges'
+)
+
+SELECT 
+    a.sale_date,
+    a.sold_num - o.sold_num AS diff
+FROM 
+    CTE_apples a
+JOIN 
+    CTE_oranges o ON a.sale_date = o.sale_date
+ORDER BY a.sale_date;