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Mysql hacking rank challenge_id = ch. P(R) represents a pattern drawn by Julia in R rows. If 2 or more users have same rating they have the same ranking but the next rank will skip that many users (if 2 users have rank 5, then The tips become powerful guidelines that enable participants to understand MySQL coding well and become experts in solving problems. The ranking functions always assign rank on basis of ORDER BY clause. (select start_date from projects where start_date not in (select end_date from projects)) a,. -- creating a view for hacker id, name and no of challenges. select case when N in (select P from BST) then (case when P is null then concat(N,' Root') else concat(N, ' Inner') end) else concat(N,' Leaf') end from BST order by N Problem. SET @rc = 0; UPDATE players JOIN (SELECT @rc := @rc + 1 AS rank, id FROM players ORDER BY rank DESC) AS order USING(id) SET players. I would like to get the rank for each user with MySQL. I want to query a rank by user id. - atanugerah/hacker-rank-sql which includes the range of ranks user is at. The rank is assigned to rows in a sequential manner. SELECT NAME FROM EMPLOYEE WHERE SALARY > 2000 AND MONTHS<10 ORDER BY EMPLOYEE_ID ASC; 0 | Permalink. In this guide, we will delve into how to use these functions to effortlessly rank data in get all the users order by rank. g. This repository contains my solutions to various SQL challenges on HackerRank, organized by categories and difficulty levels. : enclosed in parentheses). name order by challenge_count desc, So the RANK() function will assign and return the ranks of every row within a partition or full set of the ordered result table. 8k 37 37 gold badges 177 177 silver badges 359 359 bronze badges. . hacker_id = c. 143k 25 25 gold badges 199 199 silver badges 177 177 bronze badges. The uid and count(id) match, but the rank is wrong. 7 days ago + 0 comments. The ranking functions in MySQL can be used with the following clauses: They always work with the OVER() They assign a rank to each row based on the ORDER BY Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. para mysql. Query the NAME field for all American cities in the CITY table with populations larger than 120000. rank = IF( @prevInc = p. This is especially true when dealing with analytics and leaderboards. Write a query to print all prime numbers less than or equal to 1,000. Write a query to print total number of unique hackers who made at least submission each day (starting on the first day of the contest), and find the hacker_id and name of the hacker who made maximum number of submissions each day. SQL-Product-Sales-per-City files for the solutions Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Solutions to hacker rank , Mysql questions Resources. I am using a MySQL server. Take the HackerRank Certification Test and showcase your knowledge as a HackerRank verified developer. The ranking functions are also a sub-part of a window function in MySQL. Follow asked Jan 10, 2009 at 14:46. Hacker Rank Challenges Topics. ” I used the MySQL option on the platform to (Oracle owns MySQL, so don’t be surprised if you see both of these names in a course title. More posts you may like r/learnprogramming. I've seen this post MySQL get row position in ORDER BY but it doesn't have a SUM in it and I can't get it to work with SUM. Report repository HackerRank concepts & solutions. X AND F2. You can periodically flush all records under a certain rank (say, anyone ranking Write a query to output the start and end dates of projects listed by the number of days it took to complete the project in ascending order. The interviewer mentioned I will be tested on SQL and Statistics, now when I clicked on the test link to see the test overview there are 3 sections. You signed out in another tab or window. from hackers h. We use cookies to ensure you have the best browsing experience on our website. group by c2. I will elaborate on how the pseudo code for the filtering could work. , MySQL, PostgreSQL) and connect to it using a SQL client. Thanks My submissions/answers for a set of SQL query quizzes to help prepare for interview questions regarding SQL ranging from Basic SQL to Advanced SQL. units) ) AS Rank Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. score as _score, difficulty_level, s. name having challenges_created = ( select count (challenge_id) as max_challenges from challenges group by hacker_id order by max_challenges desc limit 1) or challenges_created in Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. 9377111 The Select Query would look something like this: SELECT * FROM articles ORDER BY rank DESC Query a list of CITY names beginning with vowels (a, e, i, o, u). Get data from multiple SELECT sub-queries for reporting from MySQL database. X) AND (X != Y) UNION SELECT X, Y FROM FUNCTIONS F1 WHERE X = Y AND ( (SELECT COUNT(*) FROM FUNCTIONS WHERE X = F1. Readme License. Share. I am, however, unable to figure out the worst case . Recommended Articles. from challenges as c2. Y AND F2. sql file to help readers get a notion about the challenge. Consider the following: create table submissions ( submission_date date, submission_id int, hacker_id int, score int ); create table hackers ( hacker_id int, name varchar(20) ); in Task: Find number of hackers that had at least one submission in all previous days of the period. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Stars. having c_count = (select count (c2. rank; ‘Percentiles’ is a deep dive into how percentiles are calculated using nearest rank and linear interpolation. ; Isosceles: It’s a triangle with 2 sides of equal length. Use these solutions as a reference to complete your hacker rank questions and don't just straight away copy these codes. I need a list of the top ranked players in a game. There's little reason to find alternatives. The assignment of rank to rows always start with 1 for every new partition. echo calculateRank(1,2,"2015-02-14 12:00:00"); // = -6441. Aggregate results in MySQL statement. HackerRank MySQL challenge solution in the MySQL Advance Track - GitHub - hammad-ali-shah/SQL: HackerRank MySQL challenge solution in the MySQL Advance Track Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog Although I'm not sure what "problematic" means in this context, here is the query rewritten as a plain LEFT JOIN with a subquery just to get the ranking right at the end (the ORDER BY needs to be done before the ranking);. This repository contains all 58 solutions to the HackerRank SQL Practice Questions. To promote optimal coding practices in HackerRank Tests and online interviews, our coding environment has preset time and memory limits for code execution in each programming language. Reload to refresh your session. The CountryCode for America is USA. Motivation for Upgrade. 3. Find and fix vulnerabilities About. Contribute to BlakeBrown/HackerRank-Solutions development by creating an account on GitHub. challenge_id) as c_max. in this post and other places on the web. Overview. MySql. 7 Database Administrator; Oracle Certified Professional, MySQL 8. Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. I don't know why the MySQL solution is being marked as correct (given your edit, it appears that MySQL is randomly producing the input rows in the correct order even when you are not using the correct ORDER BY clause and the output happening to be correct is purely coincidence) but it is right that the Oracle solution is incorrect as the rows are not in the correct Also, if the score is negative the rank is negative. MySQL: HackerRank. Input Format The following tables hold contest data: Hackers: The hacker_id is the id of the hacker, and name is the name of the hacker. Print your result on a single line, and use the ampersand (&) character as your separator (instead of a space). 0 Run Fork Copy link Download Share on Facebook Share on Twitter Share on Reddit Embed on website /* -- create a table CREATE TABLE students ( id INTEGER PRIMARY KEY, name TEXT NOT NULL, gender TEXT NOT NULL ); -- insert some values INSERT INTO students My solutions to HackerRank SQL problems are written in MySQL syntax and organized into separate subfiles based on three levels of difficulty: easy, medium, and hard. You signed in with another tab or window. We hope that this EDUCBA information on “MySQL RANK()” was beneficial to you. I tried Logan's query, but got the following result Hacking Mysql: Breaking, Optimizing, and Securing MySQL for Your Use Case, 380 pages, 2025-01-10. hacker_id. This tutorial is only for Educational TryHackMe: Enumerating and Exploiting MySQL March 16, 2021 2 minute read . GPL-3. That said, if you are worried about performance, there's a fairly easily solution here - cache the result of your ranking query (maybe into another a MySQL table!), and query that for all your reads. Learn about basic MySQL and My solutions to various HackerRank SQL problems using MySQL This repository contains MySQL solutions of the HackerRank SQL Intermediate Certificate problems which I encountered during the test. A subreddit for all questions related to programming in any language. Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. I was able to ban them and get rid of them (tho they rejoined after the ban about 6 times). PHP stands for Hypertext Preprocessor, and is integrated with a number of popular databases, including MySQL, PostgreSQL, Oracle, Sybase, Informix, and Microsoft SQL Server. 1. Follow HackerRank > SQL Prep > Advanced Select > Occupations. The solutions of all the SQL challenges for all easy, medium and hard challenges on HackerRank executed on MySQL environment compiled with helpful Resources & references related to the challenges. SQL-Business-Expansion and 2. Updated Specialized skills in SQL from Hacker Rank. 800 9 9 silver badges 16 16 bronze badges. This repository contains MySQL solutions of the HackerRank SQL Intermediate Certificate problems which I encountered during the test. See all from Kiruthickagp. About My solutions to Hacker-Rank SQL problems using MySQL syntax MySQL Ranking Functions. 0. mysql sql database hackerrank mysql-database sql-database hackerrank-solutions hackerrank-challenges hackerrank-sql sql-solution This is the right query but in hacker rank its showing wrong output result but you getting this question try this query it works. Working platform:- DB2, MySQL, Oracle, MS SQL Server SELECT COMPANY_CODE, FOUNDER, ( SELECT COUNT (DISTINCT LEAD_MANAGER_CODE) FROM LEAD_MANAGER WHERE COMPANY_CODE = C . 0053, and if there is, it takes 0. working platform:- mysql */ select h. group by h. HackerRank concepts & solutions. challenge_id) as c_count. 0 Database Administrator; MySQL 2021 Certified Implementation Specialist HackerRank concepts & solutions. However, after they were done trolling on the server decided to wipe ALL When working with data in MySQL, ranking rows within a result set is a common task. hacker_id, COUNT(DISTINCT j. unknownuser unknownuser. name, count (h. Follow MySQL ranking with GROUP BY and SUM. Order your output in descending order by the total number of challenges in which the hacker In this post, I’ll share my solutions to some SQL problems on HackerRank, categorized as “Easy. For example Hacker rank|SQL(Easy) |Draw The Triangle 2 |By Kiruthicka GP. r/learnprogramming. The general rule is never to assign a value to a user variable in one part select h. hack mysql> design. You switched accounts on another tab or window. This is a write up for the Enumerating and Exploiting MySQL tasks of the Network Services 2 room on TryHackMe. These tasks present an accessible way for understanding SQL, from simple questions Write a query to print the respective hacker_id and name of hackers who achieved full scores for more than one challenge. These solutions can be used as a reference for other learners or as a way to practice and improve SQL skills. 3. Why did we need to upgrade to MySQL 8. Problem Statement - 1https://www. Ranking based on (age,power) pairs and ordering by the number of coins needed which puts the minimum coins needed at the top of each partition with a rank of 1. The repository dedicated to solutions for Hacker-rank Database problems, solved with MySQL - Shounok/hackerrank-sql-solutions This a repository to solve competitive programming problems from Hacker-Rank and Leetcode. Firstly, an index on (points, name) is needed. rank = order. The problem description given for challenges are provided at the first lines of each . I've tried something like this: set @rownum := 0; SELECT @rownum := @rownum + 1 AS rank, uid, count(id) FROM `posts` GROUP BY uid ORDER BY count(id) But it returns not the right data. I am wondering if there is a query that would sum up all the points per person and order them by rank? Currently the only way I know how to get the output I'm looking for is to run this: SELECT SUM(messagePoints) HackerRank concepts & solutions. Add a comment | -1 How do i get mysql rank to go in the proper diretion. Blog; Scoring; Environment; HackerRank is the market-leading coding test and interview solution for hiring developers. Read It Now. Basic Select. The case (uppercase or Hello coders, in this post you will get all the solution of HackerRank SQL Solutions. If there is no row_number, it takes 0. shreyanshsaurav1. Domains. There are 3 types of ranking functions supported in MySQL-dense_rank(): This function will assign rank to each row within a partition without gaps (1) You can not directly call the alias in the Rank() function, which has been mentioned by Gordon (2) For your use case, you want to rank the months within each country, the rank part should be. rank = IF Hacker Rank Challenges. 0 forks. 1 watching Forks. java algorithms leetcode competitive-programming hacker-rank. names. SELECT name FROM CITY WHERE countrycode = 'USA' AND population > 120000; ID Score Rank 2 23 1 4 17 2 1 17 2 5 10 4 3 2 5 Each time a user's score is updated, The rank for the entire table must also be updated, so after a score update, the following query is run: SET @rank=0; UPDATE users SET rank= @rank:= (@rank+1) ORDER BY score DESC; HackerRank SQL Solutions. How to use subquery in SELECT clause? Problem. 15. MySQL SELECT X, Y FROM FUNCTIONS F1 WHERE EXISTS (SELECT * FROM FUNCTIONS F2 WHERE F2. Each challenge has a unique . Added on: 3/18. challenge_id) as cnt from ( Select s. A few days ago, our MySQL server was hacked it contained all of my rank data for the server. I am using DENSE_RANK as opposed to RANK because of the possibility of there being wands with the same age power and coins needed. The start date of the contest was March 01, 2016 and the end date was March 15, 2016. Which means that a completely new article with a +1/-2 would be ranked even further away then nirvana. Unfortunately this depends on the order of evaluation for user variables, which is undefined behavior. As a sanity check it must be a non-increasing value if ordered by date. Reason: Basic queries are essential for retrieving data from a database. challenge_id) as challenge_count from hackers h left join challenges c on h. hacker_id, h. price * od. If more than one such hacker has a maximum number of submissions, print the lowest hacker_id. The Fallacy of Small Functions The First Design Component-based Software Design 2024 Hi all! So I've been given the HackerRank Data Analyst test for interview, for preparation I've been doing SQL practice on HackerRank. Verify your SQL Skills. The following pattern represents P(5): Jan 14, 2024. name, count(c. sql file named after the name of the challenge. Top 1% Rank by size . SQL query to make difficult data aggregation. This function shares the ranks of rows with the same values and thus leaves holes in the rank set. Each solution is crafted to address a specific SQL problem from the HackerRank SQL challenge set, covering various aspects of SQL including querying, joins, aggregations, and more. SELECT user_id, score, @rank := @rank + 1 AS rank FROM ( SELECT u. Write a query identifying the type of each record in the TRIANGLES table using its three side lengths. Load more conversations. hacker_id group by h. Basic Select Write a query to print the respective hacker_id and name of hackers who achieved full scores for Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Some tasks have been omitted as they do not require an answer. Forks. select dataId, name, category, count(*) as cnt , row_number() over (partition by dataId, category order by count(*) desc) as "ranking" from data_category group by dataId, name, category In the above query, there is a difference in speed with and without the rank part. Contribute to JayantGoel001/MySQL development by creating an account on GitHub. Number Challenges Solutions; 1: Revising the Select Query I: Link: 2: Revising the Select Query II: Link: 3: Select All: Link: 4: Select By ID: Link: 5: Japanese Cities' Attributes: Link: 6: Japanese Cities' Names: HackerRank concepts & solutions. ) The certifications under the MySQL Certification Paths include: Oracle Certified Professional, MySQL 5. 1 watching. Query a list of top-scoring hackers. 2. Solutions of all HackerRank SQL challenges using MySQL - GitHub - hitman-dev/HACKER_RANK-SQL-SOLUTIONS: Solutions of all HackerRank SQL challenges using MySQL Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. user_id, u. 5 It explains that there is no DENSE_RANK function in MySQL and offers an alternative approach. name. 0 stars Watchers. hacker_id, name from ( Select j. Use subqueries instead: Select h. MySQL SELECT CEIL(AVG(Salary)-AVG(REPLACE(Salary,'0',''))) FROM EMPLOYEES. Mysql rank with condition. Watchers. Skip to content. My entry is like: Learn about basic MySQL and My solutions to various HackerRank SQL problems using MySQL - shanuhalli/MySQL-Basics-to-HackerRank Hacker Rank SQL Problem Solving: My solutions to various HackerRank SQL problems using MySQL. Saving reports query to database. The following is a much better solution to the problem: WITH RankedOccupations AS ( SELECT NAME, OCCUPATION, ROW_NUMBER() OVER (PARTITION BY OCCUPATION ORDER BY NAME) AS rn FROM OCCUPATIONS ) SELECT MAX(CASE WHEN OCCUPATION = 'Doctor' THEN NAME END) AS Doctor, MAX(CASE WHEN OCCUPATION = 'Professor' HackerRank concepts & solutions. Hot Network Questions What movie has a classroom clock tick backwards? HackerRank concepts & solutions. 0 license Activity. Didn't realize that it wasn't also a MySQL function. Basic SQL Queries. 0 stars. How to storing Sub query in variable. Please read our cookie policy for more information about how we use cookies. Running a Sub Query in a Mysql Statment. X AND Y = F1. Query an alphabetically ordered list of all names in OCCUPATIONS, immediately followed by the first letter of each profession as a parenthetical (i. Improve this answer. challenge_id) j INNER JOIN Difficulty d Query the name and abbreviated occupation for each person in OCCUPATIONS. Contribute to Casvill/HackerRank-MySQL development by creating an account on GitHub. hackerrank. The rank is calculated on the fly and the data is taken from two tables. 15 Hackerrank's mysql version is old; too old to support CTEs. MySQL Solutions of Hacker rank. Coming from this answer: Rank based on two columns I've the following example: CREATE TABLE tmpPoradi (`player` int, `wins` int, `diff` int) ; INSERT INTO tmpPoradi (`player`, `wins`, MySQL, PostgreSQL, and SQL Server have some of the best documentation for any system I've worked with. MySQL uses a ranking function that allows us to rank each row of a partition in the databases. hacker_id = h. Basic Select I have a mysql table with userid, rating and ranking as fields. Saved searches Use saved searches to filter your results more quickly HackerRank concepts & solutions. Write results of SQL sub query back to database. The query should print this information for each day of the contest, sorted by the date. Hello coders, in this post you will get all the solution of HackerRank SQL Solutions. So, without wasting any time, let’s jump to the After some discussion, we finally decided to pick MySQL Upgrade to 8 as one of the items. RANK() OVER (PARTITION BY country ORDER BY SUM(od. - kumod007/All-HackerRank-SQL-Challenges-Solutions Contribute to EmOnTheWeb/Hacker-Rank-MySql development by creating an account on GitHub. Improve this question. Activities involved: Writing SELECT statements, filtering results with WHERE clauses. hacker_id, h. w0051977 w0051977. Solutions for all easy, medium and hard SQL challenges on HackerRank executed on MySQL and MS SQL Server. In this post, I’ll share my solutions to some SQL problems on HackerRank, categorized as “Easy. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company This creates an inline update statement that will rank your players incrementing by the variable @rc. I am trying to update ranking column of each row in a single query based on rating (higher rating is lower rank). Hacker Rank MySQL Challenges. Now I want to show the rank (ranking of number of posts) on the user profiles. I want grouped ranking on a very large table, I've found a couple of solutions for this problem e. About. Two players, added themselves the owner rank and proceeded to stop the server. I managed to order them in the correct way but the @rank:=0 -> @rank:=@rank+1 trick, where an additional field,named rank, is calculating the position of the player that corresponds to a specific ordering parameter, doesn't return the right Host and manage packages Security. This key competency includes a basic understanding of the PHP environment, predefined PHP arrays containing variables, understanding and ability to write code to perform Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. mysql sql Resources. X > F1. SQL-Product-Sales-per-City files for the solutions HackerRank's MySQL challenges allow one to improve their SQL skills through many different tasks. Output one of the following statements for each record in the table: Equilateral: It’s a triangle with 3 sides of equal length. hacker_id=c. Find the maximum amount of money earned by any employee, as well as the number of top earners (people who have earned this amount). 5 - This is a hack that resets the next rank to 0 when MySQL iterates into a new place. I arrived at essentially the same solution, only instead of your method of counting challenges of hackers found in the Challenges table without a join (which is certainly a clean way to do it), I reused the grouping from the original join—to compare the initially derived count to the counts that are unique—in the second portion of the HAVING/OR statement. It was a long due. select salary*months as ingresos, count(*) from employee group by ingresos order by ingresos desc limit 1; mysql: select name from employee where salary > 2000 and months < 10 order by employee_id; 0 | Permalink. Need Help? View top submissions. It is a glitch in (or limitation of) the HackerRank parser for SQL input, which apparently cannot handle line breaks very well. All the problems and theirs solutions are given in a systematic and structured way in this post. Solutions to hacker rank, Mysql questions. ; Scalene: It’s a triangle with 3 sides of differing lengths. I would like to be able to get the rank of a given user_id. hacker_id group by hacker_id, h. When someone posts a new score, recalculate your temporary table. Michael Krelin - hacker Michael Krelin - hacker. 0? We had been Not a genuine coding contest? Join over 11 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. MySQL aggregation. Disclaimer: The above Problem (The Blunder) is generated by Hacker Rank but the Solution is Provided by CodingBroz. Navigation Menu Toggle navigation. MySQL 8 introduces two very powerful functions to make this task easier: RANK() and DENSE_RANK(). HackerRank for Work currently supports More than 40 different programming languages. I like to get 1 as the result of my rank when I query user #1 and #2 because both of them have 30 points. score FROM user_score u LEFT JOIN user_score u2 EmOnTheWeb/Hacker-Rank-MySql. e. Accelerate your Job Search. select * from (SELECT username, @n := @n - 1 ranking, `1st places`, `2nd places`, `3rd places`, `avg`, `1st places` + `2nd places` + `3rd places` AS `points` FROM (SELECT username, SUM(CASE WHEN rating = 1 THEN 10 ELSE 0 END) `1st places`, SUM(CASE WHEN rating = 2 THEN 5 ELSE 0 END) `2nd places`, SUM(CASE WHEN rating = 3 THEN 3 ELSE 0 END) `3rd I know I can order by the GPA, but what's the quickest way to have MYSQL return the rank as well in the rowdata I get back? sql; mysql; Share. order by c_max desc limit 1) select top (1) with ties country, colour, quantity, rank() over (partition by country order by quantity desc, id) as position from data --group by country, id, colour, quantity order by rank() over (partition by country order by quantity desc, id) Share. join challenges c on c. challenge_id from Submissions s INNER JOIN Challenges ch ON s. X = F1. The solutions of all the SQL challenges for all easy, medium and hard challenges on HackerRank executed on MySQL environment. Hello! I was stuck for a while trying to understand the solution for this problem, but I wasn’t able to find a pellucid explanation of the Verify your SQL Skills. The first comment in that link quotes the MySQL manual: "The order of evaluation for user variables is undefined and may change based on the elements contained within a given query. user #1 and #2 should have 1 as their rank value because they both have 30 points. Please check 1. I have a mySQL database table I'm using to store messages sent out to people. incidence, @nextRank := @nextRank + 1, @curRank := @nextRank := @nextRank + 1 ), 6 - This is a hack that updates the next and current ranks when the current incidence is the same as the previous incidence. name, count (c. X) > 1) ORDER BY X; (Symmetric Pairs) is generated by Hacker Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Futher queries will per written on this view CREATE VIEW hacker_challenge_count AS select h. hacker_id) as challenges_created from hackers h join challenges c on h. Example Task: Install a relational database (e. Y = F1. Start hiring at the pace of innovation! Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. com/challenges/revising-the-select-query/problemProblem Statement - HackerRank concepts & solutions. Hacker_Rank an anonymous user · November 18, 2023 MySQL MySQL 8. Follow answered Jul 6, 2017 at 17:54. The table is huge (>10K rows). Readme Activity. ” I used the MySQL option on the platform to solve each of the challenges. Julia conducted a days of learning SQL contest. Each solution includes a brief explanation of the problem and my approach to solving it. So for example if the scores for first five places are 5 4 3 3 3, the result would be: id points rank_upper rank_lower id 5 1 1 id 4 2 2 id 3 3 5 id 3 3 5 id 3 3 5 Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. I've used it many times in very similar cases, it works well and keeps it all on the DB side. hacker_id, s. If you put at least all of the case expression on one line it will work, like so:. Utilizing Discussion Forums for Learning: The crucial way through which harnessing the power of discussion forums can be maximized and the process of learning in MySQL challenge from hacker rank. There's nothing in mysql that lets you do this directly, but you can hack it in: SET @prev := null; SET @cnt := 1; SELECT name, IF(@prev <> name, @cnt := 1, @cnt := @cnt + 1) AS rank, @prev := name FROM yourtable ORDER BY name This sort of thing is easier done in your client app, using the same basic logic. Bingo, thanks. qmblix cnxb ymxi sbq gqu aitbyxc yjhxw beirz zccm wog