Done MockSql

Problem1.sql

@@ -0,0 +1,2 @@
+#Approach 1
+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 r.user_id order by travelled_distance desc, u.name;

Problem2.sql

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+#Approach 1:
+Select sale_date, 
+Sum(case when fruit= ‘apples’ then sold_num else 0 end)-
+Sum(case when fruit= ‘oranges’ then sold_num else 0 end) as diff
+From sales
+Group by sale_date
+Order by sale_date;
+
+#Approach 2:
+with cte as(
+select sale_date,sold_num from sales where fruit=”apples” order by sale_date;)
+cte1 as(
+select sale_date,sold_num from sales where fruit=”oranges” order by sale_date;)
+select t.sale_date, t. sold_num –( select t1.sale_num from cte1 as t1 where t.sale_date= t1.sale_date) as diff from cte as t;