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Hackerrank sql sol. Medium SQL (Intermediate) Max Score: 30 Success Rate: 96.


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Hackerrank sql sol Contribute to chanwaihan/HackerRank-Solutions development by creating an account on GitHub. Query the NAME field for all American cities in the CITY table with populations larger than 120000. Output one of the following statements Medium SQL (Intermediate) Max Score: 30 Success Rate: 96. 3. Beginner Certification Merit Rewards : Write a query to find employee Ids along with names of all employees who worked in Easy SQL (Intermediate) Max Score: 30 Success Rate: 94. Contribute to dudns1234/SQL-sol development by creating an account on GitHub. ; This query will return all the columns for every row in the CITY table. Certification Test. SQL Solutions: A collection of SQL queries that solve various database-related problems on HackerRank. recency | 2325 Discussions| Please Login in order to post a comment. Instant dev environments This repository contains my solutions to all SQL challenges on HackerRank. com/2024 Welcome to my repository of SQL solutions for all the challenges on HackerRank. com/challeng You are given two tables: Students and Grades. SQL (Intermediate) Skills Certification Test 35 min. 03%. Sign in Product GitHub Copilot. Business Expansion. DEV Community — A Crack SQL Interview in 50 Qs. 📜 License. Thank you to our Diamond Sponsor Neon for supporting our community. Notes. Hacker 90411 got a score of 30 for challenge 71055 with a difficulty level of 2, so 90411 There is a bug in your SQL Server code evaluator. Each solution includes a brief explanation of the problem and my approach to solving it Post displaying HackerRank sql problem solving questions and solution. Solve SQL | HackerRank We use cookies to ensure you have the best browsing experience on our website. Sql one of the most important language asked in most of the analytics interviews, in this series i will be solving sql questions from hackerrank, hackerearth My solutions to SQL problems on HackerRank # SQL Problems Page: https://www. ” I used the MySQL option on the platform to solve each of the challenges. Find the code to this problem: https://github. These solutions cover a wide range of topics including algorithms, data structures, and more. Ok | Prepare; Certify; Compete; Apply; Hiring developers? Log In; Sign Up; Prepare. shortest and longest Solutions of more than 380 problems of Hackerrank across several domains. Manage code changes Contains solved queries for the Hackerrank SQL (Basic) Skills Certification Test 🎓. ; Isosceles: It’s a triangle with 2 sides of equal length. Amber’s conglomerate corporation just acquired some new companies. Verify your SQL Skills. HackerRank is a platform for competitive coding. Leaderboard. thank you so much! really helped. 50%. SQL (Basic) SQL (Intermediate) SQL (Advanced) Difficulty. Start hiring at the pace of innovation! Skip to content. Basic Join. First Name. SQL (Intermediate) Skills Certification Test. This repository contains the solutions for HackerRank Beginner and Intermediate SQL Certifications. Unsolved. Accelerate your Job Search. Customer Spending. higher grades are entered first. 65%. 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. Basic Select. Include most of SQL practice problems and corresponding solutions on HackerRank - pyusbos/HackerRank-Practice-SQL Contribute to chanwaihan/HackerRank-Solutions development by creating an account on GitHub. com/2021/05/emp I encountered a similar situation where my CTE didn't work in HackerRank's MySQL environment. - adminazhar/-hackerrank-SQL-intermediate-skills-certification-test-solution Weather Observation Station 5 Hackerrank Solution *****For query click Here: https://realnamehiddenin. The case (uppercase or This repository contains my solutions to various SQL challenges on HackerRank, organized by categories and difficulty levels. - LinconDash/Hackerrank-SQL-Solutions. Hope I could phrase that correctly. If there is more than one Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. We use cookies to ensure Contains solved queries for the Hackerrank SQL (Intermediate) Skills Certification Test 🎓. Each solution is crafted to address a specific SQL problem from the HackerRank SQL challenge set, covering In this post, we will be covering all the solutions to SQL on the HackerRank platform. Navigation Menu Toggle navigation. MySQL ; Problem. Note: Round the average to the nearest integer. recency | 5055 Discussions| Please Login in order to post a comment. Review Profile. 69% of tech leaders are preparing their teams for GenAI. average_amount should be rounded to 2 decimal places, all dates are in the format ('YYYY-MM-DD'). 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 repository contains solutions to HackerRank SQL challenges ranging from beginner to advanced levels. We use cookies to ensure you have the best browsing experience on our website. Blame. Uncover more insights in the AI Verify your SQL Skills. instagram. In case of any double, feel free to drop a comment on a respective blog post. Instant dev This respository contains the solutions to the SQL questions on HackerRank based on Advanced Select - Sukanya807/Hackerrank_SQL_Advanced_Select Skip to content Toggle navigation This repository contains all the solutions to the SQL questions listed in the Hackerrank platform , can be used by coders for reference purpose. The solutions cover a wide range of SQL challenges, Medium SQL (Intermediate) Max Score: 20 Success Rate: 96. Ketty doesn’t want the NAMES of those students who received a grade lower than 8. ; Scalene: It’s a triangle with 3 sides of differing lengths. Basic to intermediate SQL topics 50 essential SQL questions Best for 1 month of prep time You signed in with another tab or window. com practice problems using Python 3, С++ and Oracle SQL - marinskiy/HackerrankPractice Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. My solutions to HackerRank challenges. So, if it starts with a vowel, but does not end in a vowel, it'll be shown. Query You can find HackerRank SQL problems at: https://www. Plan and track work Code Review. Also, if I agree to HackerRank's Terms of Solutions to HackerRank practice, tutorials and interview preparation problems with Python, SQL, C# and JavaScript - nathan-abela/HackerRank-Solutions Please join telegram group for querieshttps://t. Copy SQL (Basic) SQL (Intermediate) SQL (Advanced) Difficulty. Top Competitors. SQL (Basic) SQL 170+ solutions to Hackerrank. Please read our cookie policy for more information about how we use cookies. Contribute to RodneyShag/HackerRank_solutions development by creating an account on GitHub. wordpress. Medium. If two or more students both have names ending in the same This repository contains the solutions for HackerRank Beginner and Intermediate SQL Certifications. hackerrank. Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Query the names of students scoring higher than 75 Marks. I got the sol but it was not in the simple way and also took time in processing. SQL. Inside you will find the solutions to all HackerRank SQL Questions. Cancel Submit feedback Saved searches Use saved searches to filter your results more quickly. -- If more than one wand has same power, sort You signed in with another tab or window. 317 efficient solutions to HackerRank problems. We use cookies to ensure you have the best The solutions of all SQL hackerrank challenges using MySQL environment - HackerRank-SQL-sol/Advanced Select/New Companies. Your result cannot contain duplicates. - mahedei/Hackerrank-SQL-Intemediate-Skills-Certification-Test-Solutions. - adminazhar/hackerrank-SQL-basic-skills-certification-test-solution Skip to content Navigation Menu Query the Name of any student in STUDENTS who scored higher than 75 Marks. If there is more than one smallest or largest city, choose the one that comes first when ordered alphabetically. Output one of the following statements for each record in the table: Equilateral: It’s a triangle with 3 sides of equal length. Query the two cities in STATION with the shortest and longest CITY names, as well as their respective lengths (i. Table of Contents. MySQL; Problem. Binary Tree Nodes. - adminazhar/-hackerrank-SQL-intermediate-skills-certification-test-solution. Published on November 5, 2020. You signed out in another tab or Contribute to chanwaihan/HackerRank-Solutions development by creating an account on GitHub. Editorial. This repo contains notes on SQL and PostgreSQL. Open main menu. We use cookies to Contains solved queries for the Hackerrank SQL (Basic) Skills Certification Test 🎓. 82%. COUNT (DISTINCT city) count the number of row in which has the city column but did not count that row in which the city value is repeated. This repository contains my solutions to various SQL challenges on HackerRank, organized by categories and difficulty levels. Copy link. Advanced Join. by. Hard. Julia asked her students to create some coding challenges. hacker_id, name ) select hackerid, name, cnt from comp where hackerid not in (select hackerid from comp where cnt in Contribute to lpinzari/sql-psql-udy development by creating an account on GitHub. The only ones that are hidden are the ones that both start and end with vowels. ; WHERE POPULATION > Contains solved queries for the Hackerrank SQL (Basic) Skills Certification Test 🎓. Advanced Select. If there is more than one student with the same grade (8-10) assigned to them, order those particular Find the difference between the total number of CITY entries in the table and the number of distinct CITY entries in the table. Create a HackerRank account Join over 23 million developers in solving code challenges on HackerRank, These concepts introduce more complex features and functionalities of SQL. Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Guestbook. This was curated after solving all 58 questions, and achieving a score of 1130 points (WR1) Subscribe Sign in. We are the #1 global leader in developer assessment and helping companies understand and screen technical talent. Here's a breakdown of each part: SELECT *: Selects all columns from the CITY table. Solve Challenge. Problem; Input Format; Solution – Weather Observation Station 12 in SQL. COUNT(city) will count the number of row If it has city column and has value. Write better code with AI Hackerrank SQL problem to solve in Oracle's SQL version. Each of the companies follows this hierarchy: Given the table schemas below, write a query to print the company_code, founder name, -- to buy each non-evil wand of high power and age. hacker_id group by c. . Adi The PM's Substack. sort table */ with price_rank as -- ranks wands based on price for duplicated power & age ( select id, age, Contribute to tunghim/HackerRank_SQL_Solutions development by creating an account on GitHub. community/Thanks for watching us . recency | 3892 Discussions| Please Login in order to post a comment. shortest and longest city name. Ketty gives Eve a task to generate a report containing three columns: Name, Grade and Write an SQL query to compute moving average of how much customer paid in a 7 days window (current day + 6 days before) . If the city name is repeated in any row that also be counted . 2. The solutions are written in SQL and are well-commented to provide clarity. Problem 1. filter out evil wands 4. #SQL #MYSQL #DATABASE #SELECT #hackerrank #C #C++ #JAVA SELECT *FROM DEV19; So I've been given the HackerRank Data Analyst test for interview, for preparation I've been doing SQL practice on HackerRank. Solved. Automated the process of adding solutions using Hackerrank Solution Crawler. Sep 15, 2024. The CountryCode for America is USA. Hi i excited tell about SQL basic queries that using for databases In this post, I’ll share my solutions to some SQL problems on HackerRank, categorized as “Easy. The STATION table is described as follows:. That includes 25% of the Fortune 100 — and that 🏋️‍♀️ After you grasp the basics, you then jump into SQL coding questions that challenge you and make sure you mastered those SQL fundamental concepts. SELECT COUNT(CITY) — COUNT(DISTINCT CITY) FROM STATION ; X. com/2024 This intermediate SQL solution provides insights into product sales across cities, offering a comprehensive overview of customer spending patterns. blogspot. Type of Triangle. We use cookies to ensure you have the best These concepts introduce more complex features and functionalities of SQL. I will try my best to resolve your query. SELECT CEILING(AVG(SALARY - CAST(REPLACE(CAST(SALARY AS VARCHAR(10)), '0', '') AS float))) FROM EMPLOYEES. Write a query identifying the type of each record in the TRIANGLES table using its three side lengths. Sort the output by the LAST three characters of each name. tried this in oracle: with comp as ( select c. Subqueries and Nested Queries. You signed out in another tab or Explanation: SELECT *: The asterisk (*) is a wildcard character in SQL that means "all columns. SQL (Basic) SQL Medium SQL (Intermediate) Max Score: 30 Success Rate: 96. Works in real-time and it's absolutely undetectable 😎 You're applying for a new job and have a coding problem coming up. Employee Salaries Hackerrank Solution SQL *****If You want code click here:https://idiotprogrammern. me/+4-PDdc3lJGs2NGZlPlease follow us https://www. com/dev. filter out wands with duplicated power and age 3. Select shortest and longest string. Skills. sql and 2. You signed in with another tab or window. sql. Easy. This repository contains all 58 solutions to the HackerRank SQL Practice Questions. 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. They are essential for building more sophisticated and robust queries, managing data relationships, and HackerRank SQL Solutions. Then print these values as 2 space Contains solved queries for the Hackerrank SQL (Basic) Skills Certification Test 🎓. Sort by. Each solution includes a brief explanation of the problem and my approach to solving it. Devrim Ozcay. Suspicious transactions are defined as: a series of two or more transactions occur at intervals of an hour or less they are from the same sender the sum of transactions in Weather Observation Station 5 Hackerrank Solution *****For query click Here: https://realnamehiddenin. Copy Ketty gives Eve a task to generate a report containing three columns: Name, Grade and Mark. where LAT_N is the northern latitude and LONG_W is the western longitude. Nerves can peak during the programming test, and even experienced developers might blank This repository contains MySQL solutions of the HackerRank SQL Intermediate Certificate problems which I encountered during the test. They are essential for building more sophisticated and robust queries, managing data relationships, and optimizing query performance. For example, if there are three records in the table with CITY values 'New York', 'New York', 'Bengalaru', there are 2 different city COUNT is the aggregate Funtion that used to count the number of rows in a table. select CodeRankGPT helps you solve HackerRank coding problems during your coding interview. We use cookies to Problem. hassanbazaf1. In this post, I’ll share my solutions to some SQL problems on HackerRank, categorized as “Easy. We define an employee’s total earnings to be their monthly salary x months worked, and the maximum total earnings to be the maximum total earnings for any employee in the Employee table. Name. Hi i excited tell about SQL basic queries that using for databases Hello coders, today we are going to solve Weather Observation Station 17 HackerRank Solution in SQL. - Ishika63/HackerRank-SQL-Intermediate-Solution Sql one of the most important language asked in most of the analytics interviews, in this series i will be solving sql questions from hackerrank, hackerearth Samantha interviews many candidates from different colleges using coding challenges and contests. Weather Observation Station 18. The first two covering basic math and statistics and the third section Join the Type of Triangle challenge on HackerRank! Test your SQL skills by classifying triangles based on side lengths. Find and fix Include my email address so I can be contacted. 0 rather than 2253, so it is marked as an incorrect answer. Hello coders, today we are going to solve Weather Observation Station 12 HackerRank Solution in SQL. Weather Observation Station 5. Solutions to SQL Questions - HackerRank Inside you will Hello coders, today we are going to solve Top Earners HackerRank Solution in SQL. Reload to refresh your session. Articles Works Shiny Snippets Resume About Contact. This project is open-source and available under the MIT License. Write a query to print the hacker_id, name, and the total number of challenges created by each student. 😱 HackerRank jumps directly into challenging SQL coding questions that has a steep learning curve, some of those questions are not so intuitive from business perspective. Solutions to SQL Questions - HackerRank . We use cookies to Hackerrank SQL problem to solve in Oracle's SQL version. In. - Hackerrank-Sql-Solutions/ThePADS. Please check 1. Grades contains the following data:. someone please explain me why this is not correct select N, case when p is null then 'Root' when n not in Include my email address so I can be contacted. Your code evaluator returns 2253. Write a query to print the contest_id, hacker_id, name, and the sums of total_submissions, total_accepted_submissions, HackerRank SQL Problems and Solutions — 1. Solve complex problems using the triangle inequality theorem and showcase While solving all SQL problems from HackerRank, I came across multiple solutions for the same problem. mysql. At HackerRank, we have worked with over 1500+ companies and conducted more than 20 Million developer assessments. Subdomains. This repository contains a comprehensive set of SQL queries for every problem I've solved on the platform, categorized by difficulty and topic. We use cookies to ensure you have the best Thanks for watching us. "This part of the query specifies that you want to retrieve all columns from the table. Find and fix vulnerabilities Actions Problem. Copy path. Problem. Feel free to use, share, and improve upon it! 🚀 Level up your SQL skills with these HackerRank challenges and become a coding master! 🚀. I tried to provide those with explanation. Hacker 86870 got a score of 30 for challenge 71055 with a difficulty level of 2, so 86870 earned a full score for this challenge. Submissions. Contribute to lpinzari/sql-psql-udy development by creating an account on GitHub. Medium SQL (Intermediate) Max Score: 30 Success Rate: 97. Alternative Queries. Aggregation. sql files for the solutions HackerRank SQL Preparation: Weather Observation Station 1(MySQL) # sql # writeups # hackerrank # mysql. com/domains/sql_____ SUBSCRIBE!Do you want to understa Type of TriangleWrite a query identifying the type of each record in the TRIANGLES table using its three side lengths. If there is more than one smallest or largest city, choose the one that comes first when ordered Solutions to HackerRank practice, tutorials and interview preparation problems with Python, SQL, C# and JavaScript - nathan-abela/HackerRank-Solutions Contains solved queries for the Hackerrank SQL (Basic) Skills Certification Test 🎓. Problem; Input Format; Explanation; Solution – Top Earners in SQL. Discussions . Certificate: SQL Verified. -- Write a query to print the id, age, coins_needed, and power of the wands that Ron's interested in, -- sorted in order of descending power. hacker_id=h. 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 switched accounts on another tab or window. Ok | Prepare; Certify; Compete SQL. Weather Observation Station 5 Query the two cities in STATION with the shortest and longest CITY names, as well as their respective lengths (i. Write better code with AI Security. HackerRank/Programmers SQL 문제풀기. 1 day ago + 1 comment. Please signup or login in order to view this challenge. Domain Subdomain SQL: BasicSelect: Japanese Cities’ Attributes: Problem: tsql: Solution: SQL: BasicSelect: Japanese Cities’ Names: Problem: tsql In this article, I am going to share HackerRank SQL Solutions with you. Instant dev SQL. Medium SQL (Intermediate) Max Score: 30 Success Rate: 96. 0. It is very important that you all first give it a try & brainstorm yourselves before having In this post, I’ll share my solutions to some SQL problems on HackerRank, categorized as “Easy. Query . Navigation Menu Toggle navigation . Cancel Create saved search Sign in Sign up Reseting focus. Discussions. Domains Contribute to BlakeBrown/HackerRank-Solutions development by creating an account on GitHub. Revising the Select Query II. 15%. As part of a cryptocurrency trade monitoring platform create a query to return a list of suspicious transactions. Medium SQL (Intermediate) Max HackerRank is the market-leading coding test and interview solution for hiring developers. Find and fix Weather Observation Station 18. Order your output by the last three characters of each name. You signed out in another tab or window. SELECT Last Row Hackerrank challenger for SSMS without using TOP. 8223 words 42 min read Welcome to the HackerRank Solutions repository, where you can find comprehensive solutions to various HackerRank problems implemented in SQL. Whether you’re prepping for an interview or These concepts introduce more complex features and functionalities of SQL. Status. These solutions showcase different SQL techniques and HackerRank MySQL challenge solution in the MySQL Advance Track - SQL/HackerRank Advance SQL at main · hammad-ali-shah/SQL Include my email address so I can be contacted. You are viewing a single comment's thread. Samantha interviews many candidates from different colleges using coding challenges and contests. Query the list of CITY names from STATION that do not start with vowels and do not end with vowels. : number of characters in the name). You can find me on hackerrank here. SQL Basic Queries. where LAT_N is the northern latitude and LONG_W is the western SQL. Automate any workflow Codespaces. SQL (Basic) SQL Problem. sql at main · kedarvartak/Hackerrank-Sql-Solutions SQL. com/MarkusFriemann/HackerRank/blob/main/InterviewsYou find this problem at: https://www. You did such a HackerRank SQL Problems and Solutions — 1. FROM CITY: Specifies the table from which to retrieve data, which is the CITY table in this case. 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. Sign in Product HackerRank-Solutions / SQL / 4_Basic Join / 06_Ollivander-s Inventory / Ollivander's Inventory. SQL Server top function return smallest length string. /* output: - id, age, coins_needed, power - order by power desc, age desc - non-evil wands * when wands have the same power and age, choose the wand with the min price steps: 1. It's useful when you need to inspect or analyze all This repository contains MySQL solutions of the HackerRank-SQL-Intermediate-Certificate problems which I encountered during the test. Explanation: This SQL query retrieves all columns for cities in the **CITY* table where the population is greater than 100000 and the CountryCode is 'USA'. Create a HackerRank account Be part of a 23 million-strong community of developers. Please checkout my solutions and make use of it for the learning purpose only. Easy SQL (Intermediate) Max Score: 30 Success Rate: 94. More. 19. Personal. Note that the query provided by the op is not the final answer to the challenge. - adminazhar/hackerrank-SQL-basic-skills-certification-test-solution. Beginner Certification Merit Rewards : Write a query to find employee Ids along with names of all employees who worked in Hello coders, today we are going to solve Contest Leaderboard HackerRank Solution in SQL. hacker_id as hackerid, name, count(c. vedantsinghal11. Problem; Input Format; Solution – Weather Observation Station 17 in SQL. This repository contains solutions to HackerRank SQL challenges ranging from Solved and Explained HackerRank SQL basic problem (Weather Observation Station 4) Query the two cities in STATION with the shortest and longest CITY names, as well as their respective lengths (i. Manage Contribute to lpinzari/sql-psql-udy development by creating an account on GitHub. You signed out in another tab or Print the total number of challenges created by hackers. Last name select case when a+b > c and b+c > a and a+c > b then case when a=b and b=c and a=c then 'equilateral' when a=b or b=c or a=c then 'isosceles' when a<>b and b<>c and a<>c then 'scalene' end else 'not a triangle' end as type_of_triangle from triangles; SQL (Basic) SQL (Intermediate) SQL (Advanced) Difficulty. These problems are generated by HackerRank, but the solutions are provided by Niyander. To see all available qualifiers, see our documentation. Instant dev environments Issues. Find and fix Average Population. Facebook. FROM CITY: Indicates that you are selecting data from the CITY table. Write a query to find the maximum total earnings for all employees as well as the total number of employees who have maximum total earnings. 17. Solved queries for the Hackerrank SQL (Intermediate) Skills Certification Test 🎓. Medium SQL (Basic) Max Score: 25 Success Rate: 98. By detailing sales figures per city and identifying customers who spent 25% or less than More than 3,000 tech teams, representing all industries and from countries around the world, trust HackerRank to connect with developers and add cutting-edge skills to their teams. Find and fix vulnerabilities Actions. The query result format is in the following example: Return result table ordered by visited_on. Share this post . Email. sql at master · padhs/HackerRank-SQL-sol where LAT_N is the northern latitude and LONG_W is the western longitude. Each file corresponds to a specific challenge Welcome to the HackerRank SQL Solutions repository! 🚀 Dive into a curated collection of SQL queries crafted to tackle a range of challenges. Before You Launch. We define an employee’s total earnings to be their monthly salary x months worked, and the maximum total earnings to be the maximum total earnings for any employee in the Employee The question says to show the cities that do not start with vowels or do not end in vowels. HackerRank Weather Observation Station 5. However, I have an interesting observation which is that if you switch from MySQL to MySQL server, then the CTE works, as indicated by the screenshot. 1. Instant dev environments Python Solutions: A collection of solutions to HackerRank problems solved using Python. The PADS. Weather Observation Station 11. Contribute to tunghim/HackerRank_SQL_Solutions development by creating an account on GitHub. Problem; Input Format; Explanation; Solution – Contest Leaderboard in SQL. Write a query that gives month, monthly maximum, monthly minimum, monthly average temperatures for the six months. Write better code with AI SQL-sol-hackerrank Solutions to hacker rank, Mysql questions. Use these solutions as a reference to complete your hacker rank questions and don't just straight away copy these codes There is a table with daily weather data over the last 6 months of 2020, including the maximum, minimum, and average temperatures. Skip to content. Contains solved queries for the Hackerrank SQL (Intermediate) Skills Certification Test 🎓. The report must be in descending order by grade — i. e. 68%. Students contains three columns ID, Name and Marks. Our Skills Certification Test is a culmination of our learnings from working with thousands of companies and millions Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. The Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. join tables 2. Sort your results by the total number of challenges in descending order. Find and fix Ollivander's Inventory_Sol. hacker_id) cnt from challenges c inner join hackers h on c. mmgjh gsuops gxcwg ckl jvrh lcwvi igik pfmlgj jbro rpqfsv