Update top_competitors.sql

Author: erjan

hackerrank_sql_practice/top_competitors.sql

@@ -15,7 +15,7 @@ select hackers.hacker_id, name
 from submissions inner join challenges on submissions.challenge_id = challenges.challenge_id 
 inner join difficulty on difficulty.difficulty_level = challenges.difficulty_level
 inner join hackers on submissions.hacker_id = hackers.hacker_id
-where difficulty.score = submissions.score and difficulty.difficulty_level = challenges.difficulty_level
+where difficulty.score = submissions.score -- and difficulty.difficulty_level = challenges.difficulty_level - NOT NEEDED
 group by hackers.hacker_id, name 
 having count( challenges.challenge_id)> 1
 order by count( challenges.challenge_id) desc, hackers.hacker_id