Hackerrank sql problems Stars. HackerRank SQL Problems and Solutions — 3. hacker_id, h. 🎥 Welcome to Day 10 of the SQL Interview Preparation Series! Today, we’re tackling ranking and placement problems, focusing on dynamic leaderboards and dat This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Add a description, image, and links to the hackerrank-sql-problems topic page so that developers can more easily learn about it. SQL interview at Google. - The following challenges all revolve around simple SELECT statements that make use of SELECT, FROM, WHERE, and ORDER BY. It contains solutions to various SQL problems organized by topics, allowing users to enhance their SQL skills systematically. - OnkarNaik1/HackerRank-SQL-Solutions My solutions to SQL problems on HackerRank # SQL Problems Page: https://www. Welcome to the HackerRank SQL Problems repository! This collection features a variety of SQL challenges from HackerRank, designed to help you sharpen your SQL skills. , a, e, i, o, or u) from STATION. Latest commit JOIN DIFFICULTY ON CHALLENGES. Futher queries will per written on this view CREATE VIEW hacker_challenge_count AS select h. This repository tracks my progress through the SQL course on HackerRank. Sample Input 0. Search code, repositories, users, issues, pull requests Search Clear. Readme Activity. Solved. A collection of solutions to HackerRank SQL challenges, categorized by difficulty and topic. hacker_id /* but we want to be selective about which hackers we output Welcome to my repository for solving SQL problems on HackerRank! This repository contains solutions to a variety of SQL challenges and exercises that I’ve completed on HackerRank. A repository which contains solutions to all the hackerrank basic SQL solutions. put that on my CV? HackerRank has two big problems. HackerRank SQL Problems. Copy path. Please checkout my solutions and make use of it for the learning purpose only. A_challenges DESC, A. I have tried to provide the complete solution with possible explanation to all SQL Practice problem on HackerRank. Readme License. hacker_id group by hacker_id, h. I will try my best to resolve your query. hacker_id, name ) select hackerid, name, cnt from comp where hackerid not in (select hackerid from comp where cnt in A_challenges, B. One is that their questions don't make sense. Watchers. Source. Challenges. Higher than 75 marks. Contribute to tawfikhammad/SQL-Problems-Hackerrank development by creating an account on GitHub. HackerRank SQL Problem Solving Solution Challenges. select Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Easy SQL (Basic) Max Score: 10 Success Rate: 98. This repository contains the solutions to HackerRank SQL problems on Alternative Queries. Prizes. 3 of 6; Enter your code Please check first if you selected MS SQL Server from the dropdown list. Contribute to rabestro/hackerrank-sql development by creating an account on GitHub. SQL HackerRank Problems Resources. File metadata and controls. Another way to solve this query is using the pivot function in T-SQL. Articles Works Shiny Snippets Resume About Contact. It is organized into six folders, each containing my solutions for easy, medium and difficult challenges executed in a MySQL environment. Skills. Name of employees SQL. Welcome to my collection of HackerRank SQL challenge solutions! 🥷 This repository showcases my optimized and efficient SQL queries for various problem-solving scenarios. Grades contains the following data:. SQL problems and solutions. name COUNT (c. If the End_Date of the SQL. Python Solutions: A collection of solutions to HackerRank problems solved using Python. Unions-This competency includes using unions to display multiple sets of information in the same report. - dikshyant3/Hackerrank-sql-solutions Each challenge has a problem statement that includes sample inputs and outputs. 50%. Topics SQL (Intermediate) SQL (Advanced) Difficulty. 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. Advanced Select. Enjoy! About. I recommend starting a hackerrank account ahead of time and doing some challenges on your own first to scratch the rust off if needed. The thing that bothers me with HackerRank SQL questions is that it doesn't show the SQL queries output properly, like with a table, with the column names etc. Blame. Contribute to Ruksar56/Hackerrank_Sql_Queries development by creating an account on GitHub. --MS SQL with cte as (select hacker_id, count (challenge_id) Print the total number of challenges created by hackers. Solve Challenge. Each of the companies follows this hierarchy: Given the table schemas below, write a query to print the company_code, founder name, total number of lead managers, total number of senior managers, total number of managers, and total number of employees. - JawadSher/SQL-Problems-Solutions-HackerRank SELECT h. The solutions are categorized by level of difficulty Problems in HackerRank: SQL. Contribute to lalitk1997/SQL-HackerRank-Problems development by creating an account on GitHub. name order by challenge_count desc, Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Aggregation. A_challenges = 50 OR C. Julia asked her students to create some coding challenges. 0 | Parent Permalink. Note that all the nodes (in the tree) are already mentioned in the N column in the table. Resources. Hard. Sep 15, 2024. Report repository Releases. Given the CITY and COUNTRY tables, query the names of all cities where the CONTINENT is 'Africa'. CC0-1. My HackerRank Profile: Youssef Mohamed. Updated Dec 2, 2021; PHP; Athira-L-I / Some-Codes. In case of any double, feel free to drop a comment on a respective blog post. Create a HackerRank account Join over 11 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Predictive Modeling w/ Python. A_challenges DESC, C. 65%. Nerves can peak during the programming test, and even experienced developers might blank Print the total number of challenges created by hackers. of challenges should be greater than max. Would this mean I'm have a medium proficiency in SQL and could i. Star 4. of challenges created. Binary Tree Nodes. Each solution is designed to demonstrate strong analytical and query-writing skills. Please signup or login in order to view this challenge. The repository dedicated to solutions for Hacker-rank Database problems, solved with MySQL - hackerrank-sql-solutions/The PADS. SQL (Basic) SQL (Intermediate) SQL (Advanced) Number of Problems: 40: 14: 4: Domains. 0 license Activity. SQL Solutions: A collection of SQL queries that solve various database-related problems on HackerRank. Exclude These are actual problems that real companies are facing so they just confront any applicant directly with it. Write a query to output the names of those students whose best friends got offered a higher Find and fix vulnerabilities Actions. com Some challenges include additional information to help you out. A_challenges ORDER BY A. Write a query that gives month, monthly maximum, monthly minimum, monthly average temperatures for the six months. Finally, every program is threatened constantly by software patents. Feel free to use, share, and improve upon it! 🚀 Level up your SQL skills with these HackerRank challenges and become a coding master! 🚀 SQL (Structured Query Language) is a powerful tool used for managing and manipulating relational databases. hacker_id, C. You can write query for whole table (SELECT * FROM Hackers) then you can copy that output and then create new table in your local system then insert values in it SQL. I've been working through HackerRank (for like almost a year now) and recently I've been focusing on the mathematics, functional programming, and algorithms sections (I've already completed python and regex). name, C. Each problem is solved using SQL queries, and the solutions are organized for easy reference. It's all about translating the word problem into SQL, which sounds easy, but the problems are written quite weirdly on HackerRank. HackerRank; Alternative Queries Problems & Solutions. Your result cannot contain duplicates. Contribute to kaneeshadawood/Hackerrank-SQL development by creating an account on GitHub. Problem; Solution – Print Prime Numbers in SQL | Hacker Rank Solution. Query the list of CITY names from STATION which have vowels (i. Basic Select. We use cookies to ensure you have the best browsing experience on our website. African Cities. There are a total of 58 problems of varying difficulty level that test different concepts. You signed in with another tab or window. Easy. These solutions cover a wide range of topics including algorithms, data structures, and more. - You signed in with another tab or window. contador = 1 ORDER BY C. - HackerRank-SQL/Hard/Interviews. Top. Applying the conditions to exclude more than one hacker for same no. " Learn more Solving SQL HackerRank Problems. Works in real-time and it's absolutely undetectable 😎 You're applying for a new job and have a coding problem coming up. About. Samantha interviews many candidates from different colleges using coding challenges and contests. Open main menu. The output is in a "code-ish" format. Include my email address so I can be contacted. 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 This collection features a variety of SQL challenges from HackerRank, designed to help you sharpen your SQL skills. 2 days ago + 0 comments. The solutions of all SQL HackerRank challenges using MySQL environment - HackerRank-SQL-Challenges-Solutions/README. 83%. java Data Structures Trees: Is This a Binary Search Tree? 30 Solution. Dec 12, 2024. In this repository you will find my answers to the SQL challenges proposed in HackerRank, from basic to advanced level. You may add any prizes that you would like to offer here. Sort by. Write a query to print the hacker_id, name, and the total number of challenges created by each student. Note: CITY. main You signed in with another tab or window. This is hard level SQL interview question asked at Google, Meta and Amazon. Write a query to print You signed in with another tab or window. recency | 850 Discussions| Please Login in order to post a comment. Easy SQL (Intermediate) Max Score: 30 Success Rate: 94. Let's connect!, My linkedin Profile: Youssef Mohamed. -- If more than one student created the same number of challenges, then sort the result by hackerid HAVING no_of_challenges = (SELECT count Solutions for Hackerrank SQL problems. Whether we are beginners or experienced professionals, practicing SQL exercises is important for improving your skills. Basic Select A collection of HackerRank SQL problems. Medium SQL (Intermediate) Max Score: 30 Success Rate: 97. Challenges | Medium | HackerRank. Medium. hacker_id) cnt from challenges c inner join hackers h on c. Friends contains two columns: ID and Friend_ID (ID of the ONLY best friend). Code Issues Pull requests These Contain Some SQL Programming Solution of Hacker Rank😏 . I tried to provide those with explanation. Discussions. The PADS. Updated Jan 26, 2021; akshat-jjain / HackerRank-SQL-Solutions. Tags: MySQL; SQL; Basic Select; Aggregation. ChatGPT. Reload to refresh your session. SQL (Structured Query Language) is the backbone of data management and analysis. These solutions showcase different SQL techniques and Solutions to Hackerrank SQL problems. Students contains two columns: ID and Name. Anyway, as we are supposed to print the total number of challenges created by each student the WHERE clause: This repository contains solutions to all the HackerRank SQL Practice Questions - HackerRank-SQL-Challenges-Solutions/Advanced Join/SQL Project Planning. 3 of 6; Enter your code Code your solution in our custom editor or code in your own environment and upload your solution as a file. To practice this SQL translation skill can also check out the 60+ question on DataLemur You signed in with another tab or window. hacker_id /* after they have been grouped by hacker */ group by c. hacker_id as id, h. Editorial. -- creating a view for hacker id, name and no of challenges. Japanese cities name. Welcome to my HackerRank SQL Solutions repository! This repository contains my solutions to 58 SQL problems from HackerRank. mysql challenge sql hackerrank mysql-database hackerrank-solutions hackerrank-sql hackerrank-sql-solutions. 21 stories While solving all SQL problems from HackerRank, I came across multiple solutions for the same problem. HackerRank changed the default sql_mode behavior to only_full_group_by at some point after I posted this. Whether you're a beginner or an experienced developer, you'll find solutions and explanations for everything from basic queries to advanced data manipulation. , a, e, i, o, and u) as both their first and last characters. Population Census . Whether you're a beginner or an experienced developer, you'll find 45. SQL (Intermediate) SQL (Advanced) Difficulty. You are given two tables: Students and Grades. Unsolved. So while the answer is Wrong, the result of the query is working in the MySQL Server environment. Subqueries-This competency includes using data based on information returned from a different query. Problem 1: Solution: Problem 2: Solution: Problem 3: Solution: About. main SQL (Intermediate) SQL (Advanced) Difficulty. Write a query to print the hacker_id, name, and the total number of challenges created by each student. Rather it was used by the op to demonstrate the issue. Contribute to jxareas/SQL-for-HackerRank development by creating an account on GitHub. - Issues · adminazhar/hackerrank-SQL-basic-skills-certification-test-solution Search code, repositories, users, issues, pull requests Search Clear. CodeRankGPT helps you solve HackerRank coding problems during your coding interview. The following challenges use simple aggregation functions such as MIN, MAX My solutions to various hackerrank SQL problems using DB2. md at main · md-sawrab/HackerRank-SQL-Challenges-Solutions hackerrank-sql-challenges Star Here are 3 public repositories matching this topic MD-MAFUJUL-HASAN / HackerRank_SQL_Solution Star 3. Sort your results by Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Automate any workflow Add this topic to your repo To associate your repository with the hackerrank-sql-solutions-oracle topic, visit your repo's landing page and select "manage topics. Contribute to xShaimaa/HackerRank-SQL-Challenges development by creating an account on GitHub. hackerrank hackerrank-python hackerrank-solutions hackerrank-java hackerrank-cpp hackerrank-algorithms-solutions hackerrank-javascript hackerrank-30dayschallange hackerrank-challenges hackerrank-sql hackerrank-datastructure hackerrank-linuxshell hackerrank-regex hackerrank-bash hackerrank-python-practice hackerrank-mathematics This repository contains solutions to all the HackerRank SQL Practice Questions - HackerRank-SQL-Challenges-Solutions/Basic Select/Weather Observation Station 3. . Harshit Singh. of challenges created, the no. Complex joins-This competency includes using INNER, LEFT, RIGHT, and FULL joins on multiple tables and using joins for many-to-many relationships. Taught by: nbkhope. Problem 1. Q. Order your output by ascending company_code. The solutions of all the Hackerrank SQL challenges for all easy, medium and hard challenges executed on Oracle environment. Alternative Queries. 1 watching. tnguyen29. sql. DIFFICULTY_LEVEL . The WHERE clauses will use and three basic boolean operators as well as some of the most used functions. A_challenges = B. SQL is a fun language because it's super easy to start, then you find a cliff, then it clicks and you can do almost anything (until mysql challenge tutorial sql guide oracle tutorials hackerrank plsql challenges problem problems guides hackerrank-solutions hackerrank-challenges hackerrank-sql-solutions hackerrank-problems hackerrrank-sql hackerrank-sql-problems hackerrank-sql-challenges Solutions to HackerRank's SQL challenges. sql at master · Shounok/hackerrank-sql-solutions This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Top Competitors. Share your videos with friends, family, and the world Find the number of hackers for each no. If you get stuck on any of the problems, feel free to check Medium SQL (Intermediate) Max Score: 20 Success Rate: 96. hacker_id You are given a table, Projects, containing three columns: Task_ID, Start_Date and End_Date. There can be multiple ways of approaching solution to any problem. Also, a full solution without the need to change modes was posted by @dougal_michael below, which uses the MIN() function instead. as c_count /* this is the join we want to output them from */ from Hackers as h inner join Challenges as c on c. hacker_id as hackerid, name, count(c. Please check first if you selected MS SQL Server from the dropdown list. HackerRank SQL Problems and Solutions — 1. Contribute to mdnurahmed/hackerrank-sql-problems development by creating an account on GitHub. The solutions of all SQL HackerRank challenges using MySQL environment - md-sawrab/HackerRank-SQL-Challenges-Solutions This repository contains my solutions to various SQL challenges from HackerRank. Sep 15. sql at main · Surabhi195/HackerRank-SQL-Challenges-Solutions SQL. Table of Contents. Write a query to print the contest_id, hacker_id, name, and the sums of total_submissions, total_accepted_submissions, total_views, and total_unique_views for each contest sorted by contest_id. The output you're creating isn't logically useful if you think about it find total number of view, total number of unique views, total number of submissions and total number of accepted submissions. This project is open-source and available under the MIT License. It is guaranteed that the difference between the End_Date and the Start_Date is equal to 1 day for each row in the table. Jul 27. Note: Round the average to the nearest integer. 40 Average Population of Each Continent | SQL Basic Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. sql at main · Pavith19/HackerRank-SQL-Challenges-Solutions Print the names of employees who earn more than $2000 per month and have worked at the company for less than 10 months. This repository contains solutions for Hacker Rank SQL problems. This question is published at stratascratch. Depending on the job requirements, the complexity of what they're looking for can vary, but BI roles Contribute to ugaliguy/HackerRank development by creating an account on GitHub. You are viewing a single comment's thread. The goal of this repository is to document and share SQL queries that I have implemented to solve real-world scenarios and coding challenges. Japan Population. Java and SQL practice. Packages contains two columns: ID and Salary (offered salary in $ thousands per month). hacker_id=h. Create a HackerRank account Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. 2 of 6; Choose a language Select the language you wish to use to solve this challenge. It serves as a record of my progress and showcases my understanding of SQL concepts and problem-solving skills. Contains solved queries for the Hackerrank SQL (Basic) Skills Certification Test 🎓. 03%. Query the names of all the Japanese cities in the CITY table. Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. java Algorithms DFS: Connected Cell in SQL. SQL interview question asked at google and amazon. Packages 0. List of solved Hackerrank challenges in PHP language. All solutions are solved in MySQL DBMS. SQL. My solutions to various hacker-rank SQL problems using DB2 syntax Resources. Prizes are optional. The COUNTRYCODE for Japan is JPN. Data Structures Linked Lists: Detect a Cycle 25 Solution. com. It’s a collection of queries I’ve written to practice and improve my SQL skills. There is a table with daily weather data over the last 6 months of 2020, including the maximum, minimum, and average temperatures. sql at master · amitverma80/HackerRank-SQL The solutions of all SQL hackerrank challenges using MySQL environment - HackerRank-SQL-Challenges-Solutions/Basic Join/Challenges. sql at main · Pavith19/HackerRank-SQL-Challenges-Solutions This repository contains solutions to various SQL challenges and problems solved on HackerRank. HackerRank / SQL / Basic-Join / full-score. Students contains three columns ID, Name and Marks. Code SQL. Listed below are the questions available in this repository. md at master · chhayac/SQL-hackerrank-problems Contribute to hnamtraan/hackerrank-sql development by creating an account on GitHub. The solutions of all SQL hackerrank challenges using MySQL . Advanced Join. 17211a0529. 39 African Cities | SQL Basic Join | HackerRank Solution 2m 39s. If so, my solution should work fine, I even checked it today by inserting the code to the hackerrank's code editor and it passed the sample test case. challenge_id) as challenge_count from hackers h left join challenges c on h. This respository contains the solutions to the SQL questions on HackerRank based on Alternative queries. sql_mode=full_group_by is enabledthat's why its not woking. You signed out in another tab or window. 183 forks. Submissions. java Data Structures Queues: A Tale of Two Stacks 30 Solution. java Data Structures Stacks: Balanced Brackets 30 Solution. contador FROM A INNER JOIN B ON A. Please find the provided solutions for learning purposes only. 7 hours ago + 0 comments. This repository contains my SQL solutions to problems from platforms like HackerRank. DIFFICULTY_LEVEL = DIFFICULTY. Lists. no. Readme Welcome to the HackerRank SQL Challenges Solutions repository! This repository contains my solutions to all the HackerRank SQL Practice Questions. For some problems, I provided more than one solution. 4 of 6; Amber's conglomerate corporation just acquired some new companies. hacker_id) SELECT C. MySQL Server; Problem. Weather Observation Station 6. Post displaying HackerRank sql problem solving questions and solution. Basic Join. Japanese cities attribute. 1 Revising the Select The goal of /r/SQL is to provide a place for interesting and informative SQL content and discussions. Revising the Select Query I. php hackerrank hackerrank-solutions hackerrank-php. I finished the following problems in its SQL section. Subdomains. Problem. SQL (Basic) SQL (Intermediate) SQL (Advanced) Difficulty. This might not address the issue in the MySQL setting, but at least it allowed me to HackerRank is a platform where users can practice coding skills. 20 stories SQL problems and solutions. thank you so much! really helped. You are given three tables: Students, Friends and Packages. Search syntax tips. Sort your results by the total number of challenges in descending order. Create a HackerRank account Be part of a 23 million-strong community of developers. My solutions to various hacker-rank SQL problems using DB2 syntax - SQL-hackerrank-problems/README. No releases published. Weather Observation Station 8. tried this in oracle: with comp as ( select c. Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. recency | 5292 Discussions| Please Login in order to post a comment. hacker_id=c. Query the list of CITY names starting with vowels (i. name, count(c. Employee salaries. Forks. Provide feedback We read every piece of feedback, and take your input very seriously. I'm currently doing medium difficulty SQL Practice Problems fairly well, not having to look too much up. Published on November 5, 2020. Curate this topic Add this topic to your repo To associate your repository with the Join over 11 million developers in solving code challenges on HackerRank, one of the best ways to prepare Este es un conjunto de retos de SQL seleccionados para practicar los contenidos del curso de SID1 as well as for procurement and distribution of all prizes. Leaderboard. 0 stars. akshithalachu68. of 📜 License. Ketty HackerRank SQL Problems and Solutions — 1. Ok | Prepare; Certify; Compete If such problems arise substantially in other domains, we stand ready to extend this provision to those domains in future versions of the GPL, as needed to protect the freedom of users. Solving code challenges on HackerRank is one of the best ways to prepare for programming interviews. hacker_id = h. The contest creator holds HackerRank harmless from and against any and all Print the total number of challenges created by hackers. --COUNT (CHALLENGES_CREATED) OVER (PARTITION BY CHALLENGES_CREATED) AS NO_OF_COMMON_CHLNG_HCKR 4. Whether you are a beginner or an experienced coder, this repository aims to provide clear and efficient solutions to help you improve your problem-solving skills. Ketty gives Eve a task to generate a report containing three columns: Name, Grade and Mark. Hackers Table: Challenges Table: Sample Output 0. A_challenges FROM C WHERE C. Medium SQL (Intermediate) Max Score: 30 Success Rate: 96. Guestbook. Regular practice helps you get better at using SQL and boosts your confidence in handling different database tasks. Exactly. If more than one student created the same number of challenges, then sort the result by This repository contains my solutions to all the HackerRank SQL Practice Questions. challenge_id) OVER (PARTITION BY h. Welcome to the HackerRank Solutions repository, where you can find comprehensive solutions to various HackerRank problems implemented in SQL. While solving all SQL problems from HackerRank, I came across multiple solutions for the same Hackerrank is a great platform to practice SQL queries. MS SQL using WITH /* count total submissions of challenges of each user */ WITH data AS (SELECT c. -java hackerrank-ruby hackerrank-algorithms-solutions hackerrank-javascript hackerrank-30dayschallange hackerrank-php hackerrank-challenges hackerrank-sql hackerrank-regex SQL Problem Solutions on HackerRank This repository contains my solutions to various SQL problems from HackerRank. Code. e. hacker_id, h. Some challenges include additional information to help you out. the following code works. It includes efficient SQL queries, problem-solving techniques, and well-documented scripts. 8223 words 42 min read Easy SQL (Intermediate) Max Score: 30 Success Rate: 94. 212 stars. You switched accounts on another tab or window. mysql sql hackerrank learning-exercise hackerrank-solutions hackerrank-sql hackerrank-sql-challenge upskilling certify-maintenance hackerrank-sql-certificate Updated Feb 16, 2024; tphuongvo / SQL-PracticeProblems Star 1. Player with Longest Streak. 71%. 6: Binary Tree Nodes: Solution: We can write this query using simple case when statements. Exclude the contest from the result if all four sums are . I solved these problems to About. Japanese Cities' Names. The solutions are organized by topics and updated regularly as I solve new problems. Meesho_HackerRank_SQL_Interview_Question. Explore these solutions to understand different SQL problems and enhance your skills. name as name, count Hello coders, today we are going to solve Print Prime Numbers HackerRank Solution in SQL. This page contains solutions for all HackerRank SQL challenges which were passed successfully. Each link leads to the document containing both, the question statement and the answer, written in MS SQL Server (except for two short problems that were written in SQL. Anyway, as we are supposed to print the total number of challenges created by each student the WHERE clause: baarayy/Hackerrank-SQL-Problems. 21283 Angela 6 88255 Patrick 5 96196 Lisa 1 The solutions of SQL hackerrank problems . However, in the above query I have tried sticking to using standard SQL. name) AS total_challenges FROM Hackers AS h INNER JOIN Challenges AS c USING (hacker_id) ORDER BY total_challenges DESC, hacker_id; You signed in with another tab or window. 0 forks. 0 stars Watchers. Code Issues Pull requests hackerrank This repository features solutions to various intermediate-level SQL challenges from HackerRank. 9 watching. Challenges: The challenge_id is the id of the challenge, and hacker_id is the id of the student who created the challenge. hacker_id group by c. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Status. Print the total number of challenges created by hackers. Please read our cookie policy for more information about how we use cookies. CountryCode Edits: Updated with the sql_mode='' based on @jakab922's comment. dekbjigkfiuhgbpknrbhbkcvxtyfeknzitzguxawgiblwdrehymtu