Mock sql first commit

apples_oranges.sql

@@ -0,0 +1,14 @@
+--Solution 1
+select s.sale_date, (s.sold_num - s1.sold_num) as 'diff' from sales s 
+join sales s1 on s.sale_date = s1.sale_date 
+and s.fruit = 'apples' and s1.fruit = 'oranges' 
+group by s.sale_date order by s.sale_date
+
+--Solution 2
+with cte as (
+    select sale_date, sold_num from sales where fruit = 'apples'),
+acte as (
+    select sale_date, sold_num from sales where fruit = 'oranges')
+select c.sale_date, (c.sold_num - a.sold_num) as 'diff' from cte c 
+join acte a on c.sale_date = a.sale_date order by c.sale_date
+

top_travellers.sql

@@ -0,0 +1,12 @@
+SELECT 
+    u.name, 
+    IFNULL(SUM(distance),0) AS travelled_distance
+FROM 
+    Users u
+LEFT JOIN 
+    Rides r
+ON 
+    u.id = r.user_id
+GROUP BY 
+    u.id
+ORDER BY 2 DESC, 1 ASC