mock test

1.sql

@@ -0,0 +1,9 @@
+# Write your MySQL query statement below
+select a.sale_date, a.sold_num - b.sold_num as diff
+from Sales a
+join Sales b
+on a.sale_date = b.sale_date
+and a.fruit in ('apples')
+and b.fruit in ('oranges')
+group by 1
+order by 1

2.sql

@@ -0,0 +1,6 @@
+select u.name, ifnull(sum(r.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