improved some queries

advanced-join/interviews.sql

@@ -29,6 +29,7 @@ GROUP BY
     ,total_submissions
     ,total_accepted_submissions
 )
+
 SELECT
       contest_id
     , c.hacker_id
@@ -50,4 +51,4 @@ GROUP BY
     , c.hacker_id
     , c.name
 ORDER BY
-    contest_id;
+    contest_id;

advanced-join/projects.sql

@@ -1,4 +1,7 @@
 -- Projects
 -- https://www.hackerrank.com/challenges/projects/problem
 
-set @row1:=0; set @row2:=0; select p_start.start_date,p_end.end_date from (select @row1:=@row1+1 as rown, start_date from projects where start_date not in (select end_date from projects)) as p_start inner join (select @row2:=@row2+1 as rown, end_date from projects where end_date not in (select start_date from projects)) as p_end on p_start.rown=p_end.rown order by p_end.end_date-p_start.start_date,p_start.start_date;
+set @row1:=0; set @row2:=0; select p_start.start_date,p_end.end_date from
+  (select @row1:=@row1+1 as rown, start_date from projects where start_date not in (select end_date from projects)) 
+  as p_start inner join (select @row2:=@row2+1 as rown, end_date from projects where end_date not in 
+  (select start_date from projects)) as p_end on p_start.rown=p_end.rown order by p_end.end_date-p_start.start_date,p_start.start_date;

alternative-queries/draw_the_triangle_2.sql

@@ -1,4 +1,5 @@
 -- Draw The Triangle 2
 -- https://www.hackerrank.com/challenges/draw-the-triangle-2/problem
 
-SELECT REPEAT('* ', @NUMBER := @NUMBER + 1) FROM information_schema.tables, (SELECT @NUMBER:=0) t LIMIT 20
+
+SELECT REPEAT('* ', @NUMBER := @NUMBER + 1) FROM information_schema.tables, (SELECT @NUMBER:=0) t LIMIT 20