Hackerrank sql basic join solutions. 8223 words 42 min read ––– views.

Hackerrank sql basic join solutions Input Format. The Report. Editorial. txt at main · mahedei/Hackerrank-SQL-Basic-Skills-Certification-Test-Solutions HackerRank: SQL - All solutions (Basic Select, Advanced Select, Aggregation, Basic Join, Advanced Join, Alternative Queries) Coursera: Machine Learning (Week 2) [Assignment Solution] - Andrew NG Coursera: Machine Learning - All weeks solutions [Assignment + Quiz] - Andrew NG You signed in with another tab or window. Revising the Select Query I – HackerRank Solution -- - Solution 2: Uses CTE to create master data and filters the CTE inside of where clauses. - adminazhar/hackerrank-SQL-basic-skills-certification-test-solution Contribute to chanwaihan/HackerRank-Solutions development by creating an account on GitHub. 7) will return 2; AVG is an aggregation function used to calculate the average of the HackerRank concepts & solutions. If Hackers: The hacker_id is the id of the hacker, and name is the name of the hacker. Accelerate your Job Search. SELECT H. So, without wasting any time, let’s jump to the solutions. Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Curate this topic Add this topic to your repo GitHub:https://github. population)) from country join city on city. 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. Population Census . Discussions. Contribute to chanwaihan/HackerRank-Solutions development by creating an account on -- Given the CITY and COUNTRY tables, query the sum of the populations of all cities where the CONTINENT is 'Asia'. Solve SQL | HackerRank We use cookies to ensure you have the best browsing experience on our website. Reload to refresh your session. change to MS SQL SERVER . name having count You signed in with another tab or window. 7 years ago + 10 comments. Marks BETWEEN Grades. It is organized into six folders, each containing my solutions for easy, medium About. Student analysis SQL solution- SELECT a. ; JOIN and INNER JOIN are the same in SQL. contest_id JOIN Challenges AS chl ON chl. roll_number GROUP BY b. Contribute to gnodivad/HackerRank_Solutions development by creating an account on GitHub. roll_number, a. . It will help you learn and understand SQL in a better way. Why this video is 7. Grade < 8 THEN NULL ELSE Students. Topics The solutions of all the SQL challenges for all easy, medium and hard challenges on HackerRank executed on MySQL environment compiled. This collection provides solutions to the HackerRank SQL Certification Test problems. - mahedei/Hackerrank-SQL-Basic-Skills-Certification-Test-Solutions Basic Join/002. name from submissions s inner join challenges c on s. HACKER_ID, Join students and grades table on students. roll_number,a. code. Verify your SQL Skills. hacker_id where s. sql at main · Surabhi195/HackerRank-SQL You need to figure out a logical way to JOIN these tables together since there’s not one primary key. continent, round(avg(C. Write a query to print the hacker_id, name, and the total number of challenges created by each student. I hope this Solved queries for the Hackerrank SQL (Basic) Skills Certification Test 🎓. Here’s a cool problem from HackerRank that’s specifically centered around JOINING and CASE usage. hacker_id, t1. Contribute to BlakeBrown/HackerRank-Solutions development by creating an account on GitHub. Healthcare Financial services Manufacturing HackerRank / SQL / Basic-Join / full-score. If the value of is_evil is 0, it means that the wand is not evil. min_mark and grades. HACKER_ID GROUP BY H. Blame. You are viewing a single comment's thread. g. Problem. 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. Solutions to the SQL HackerRank challenges. HackerRank SQL Problems and Solutions — 1 You signed in with another tab or window. TOPICS: Basic Select; Advanced Select; Aggregation; Basic Join; Advanced Join; Alternative Queries; SQL solutions are coded using MySQL Contains solved queries for the Hackerrank SQL (Basic) Skills Certification Test 🎓. This repository contains solutions to all the HackerRank SQL Practice Questions - HackerRank-SQL-Challenges-Solutions/Basic Join/Challenges. Platform Help | Execution Environment | FAQ. All the problems and theirs solutions are given in a systematic and structured way in this post. Return to all comments →. roll_number group by b. Given the CITY and COUNTRY tables, query the sum of the populations of all cities where the CONTINENT is ‘Asia’. subject_three) < 100; My solutions to HackerRank problems. Code are matching key columns. Activities involved: Setting up a database environment and understanding SQL’s purpose and use cases. 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 You signed in with another tab or window. SQL (Basic) #1 SQL: Merit Rewards On the basis of merit, a company decides to promote some of its employees in its HR division at the end of the quarter because of their high performance. Revising the Select Query I. AI Mind. contest_id = clg. 5 only(as mentioned in the comment by @fuber). DH Hi i excited tell about SQL basic queries that using for databases operation. Write a query to print the id, age, coins_needed, and power of the wands that Ron’s interested in, sorted in order of My solutions to HackerRank problems. sql at master · marinskiy/HackerrankPractice 170+ solutions to Hackerrank. hacker My solutions to HackerRank problems. higher grades are entered first. Here I will try to provide multiple approaches & solutions to the same problem. HACKER_ID, H. Solutions for all SQL challenges on HackerRank executed on MySQL and MS SQL Server. I used specifically MySQL to solve this problem! The solutions of all SQL hackerrank challenges using MySQL environment - HackerRank-SQL-Challenges-Solutions/Basic Join/Challenges. Post displaying HackerRank sql problem solving questions and solution. SELECT t1. Topics You did such a great job helping Julia with her last coding contest challenge that she wants you to work on this one, too! The total score of a hacker is the sum of their maximum scores for all of the challenges. CHALLENGE_ID) AS TOTAL FROM HACKERS H, CHALLENGES C WHERE H. roll_number HAVING SUM(b. Feel free to explore and use the solutions as a reference for you - Hackerrank-Sql Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Skip to content. Hackerrank-SQL-Solutions -- to buy each non-evil wand of high power and age. Solution using Joins is faster although it uses much space but for time being space is not a constraint but time is , so using join is a faster and efficient way noy yours It contains solutions to various SQL problems organized by topics, allowing users to enhance their SQL skills systematically. Given the CITY and COUNTRY tables, query the sum of the Here are the 4 questions asked in HackerRank SQL Basic Certification Exam, from these 2 will be available in one attempt. challenge_id inner join difficulty d on c. Contribute to Imtiaze/HackerRank_SQL_Solutions development by creating an account on GitHub. sql at main · qanhnn12/SQL-Hackerrank-Challenge-Solutions Problem. While solving all SQL problems from HackerRank, I came Write a query to print the hacker_id, name, and the total number of challenges created by each student. Contribute to dkeitley/sql-hackerrank development by creating an account on GitHub. Efficient solutions to HackerRank SQL problems This repository consists of all the SQL Solutions as of 10th April 2020. Note: CITY. Basic Select. 1 Revising the Select Query I SQL 2 Revising the Select Query II SQL Hackerrank SQL: Basic Join. In this repository, you will find updated SQL solutions for all HackerRank problems as of 2024. Contribute to Relasee/Hackerrank_Solutions development by creating an account on GitHub. subject_two + em. Julia just finished conducting a coding contest, and she needs your help assembling the leaderboard! Write a query to print the respective hacker_id and name of hackers who achieved full scores for more than one challenge. Join me as I tackle challenges ranging from basic queries to advanced techniques! SELECT a. See sample input, output and explanations for each query. Submissions: The submission_id is the id of the submission, hacker_id is the id of the hacker who made the submission, challenge_id is the id of the challenge for which the You signed in with another tab or window. These questions not only tested my technical skills but also challenged me to think critically. - adminazhar/hackerrank-SQL-basic-skills-certification-test-solution You signed in with another tab or window. grade There are two ways to solve it: Reminder: Answers generated by artificial intelligence tools are not allowed on Stack Overflow. - SQL-Hackerrank-Challenge-Solutions/Basic Join/Population-Census. My solution in SQL Server: SELECT id, age, coins_needed, power FROM Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. subject_two + b. Number Challenges Solutions; 1: Asian Population: SQL: 2: African Cities: SQL: 3: Average Population of Each Continent: SQL: 4: The Report: SQL: 5: Top Competitors: SQL: 6: SUM is an aggregation function used to calculate the sum or total of the values of all the records in the column name passed to the function. Harry Potter and his friends are at Ollivander’s with Ron, finally replacing Charlie’s old broken wand. Reason: Fundamental setup and understanding are necessary to start writing SQL queries. About. There are two ways to solve it: Use ROUND but subtract 0. If more than one student created the same number of challenges, then sort the result by hacker_id. Leaderboard. 0. 11 | Parent Permalink. Max_Mark ORDER BY Since you used ROUND, it will will round down values below 0. Table s will give all the Start_Dates of the project LOGIC: All the Start_Dates which are not present in column End_Date are the Start_Date of the Project. - SQL-Hackerrank-Challenge-Solutions/Basic Join/Average-Population-of-Each-Continent. sql at main · qanhnn12/SQL-Hackerrank-Challenge-Solutions 317 efficient solutions to HackerRank problems. The HackerRank SQL Basic Certification is designed to test fundamental SQL concepts, such as querying databases, filtering data, and performing basic joins. HackerRank SQL Solutions. Contribute to vrushalird/HackerRank-SQL-Solutions development by creating an account on GitHub. HackerRank SQL Problem Solving Questions With Solutions # Related Topics: SQL SQL-Problem-Solving FROM Hackers AS h JOIN Challenges AS c ON h. Population Census: Easy. com/challenges/asian-populationLearn: Full HackerRank SQL Basic Certification Solution Video Student Analysis SQL solution in SQL SELECT a. POPULATION)-0. SQL (Structured Query Language) is a powerful tool used for managing and manipulating relational databases. NAME, COUNT (C. My solutions to HackerRank challenges. Guestbook. Contribute to RodneyShag/HackerRank_solutions development by creating an account on GitHub. - Hackerrank-SQL-Basic-Skills-Certification-Test-Solutions/Merit_ Rewards_SQL. 5) FROM CITY AS C INNER JOIN COUNTRY AS CO ON Contribute to chanwaihan/HackerRank-Solutions development by creating an account on GitHub. sql at main · Pavith19/HackerRank-SQL-Challenges-Solutions Solutions By company size. Simple MySQL solution. Navigation Menu Toggle navigation. countrycode = CO. HACKER_ID=C. You can find HackerRank SQL problems at: https://www. hacker_id = h. I have also earned a 5-star badge on HackerRank for SQL, I started studying SQL from a very famous site - HackerRank. Table e will give all the End_Dates of the project LOGIC: All the End_Dates which are not present in column Start_Date are the End_Date of the Project. max_mark. Inside you will find the solutions to all HackerRank SQL Questions. Basic Join. name FROM hackers AS t1 JOIN submissions AS t2 ON t1. The problem. ) Eg. I have tried to provide the complete solution with possible explanation to all SQL Practice problem on HackerRank. The solutions of all the Hackerrank SQL challenges for all easy, medium and hard challenges executed on Oracle environment. , MySQL, PostgreSQL) and connect to it using a SQL client. subject_three) < 100; Ketty gives Eve a task to generate a report containing three columns: Name, Grade and Mark. The report must be in descending order by grade — i. SQL solutions. code group by continent ; Join us Create a HackerRank account Solutions for all SQL challenges on HackerRank executed on MySQL and MS SQL Server. Our goal is to query the sum of populations for all cities located in the continent of Asia. 5 hours long? Because Im solving ALL of the SQL Problems on Hackerrank in this video. If more than one student created the same number of Learn SQL with multiple approaches and solutions to HackerRank problems involving inner join, having and sub-query. population),0) from city C join country CO on C. of questions 2 questions. total_unique_views) FROM Contests AS cts JOIN Colleges AS clg ON cts. Average Population of Each Continent. Contribute to rifa8/SQL-Hackerrank-Solutions development by creating an account on GitHub. Copy path. Regular practice helps you get better at using SQL and boosts your confidence in handling different database tasks. Enterprises Small and medium teams Startups By use case. Each solution is written in structured query language (SQL), showcasing my proficiency across various levels of difficulty, from basic queries to advanced topics like joins, aggregations, and window functions. HackerRank-Solutions / sql / intermediate / basic-join / contest-leaderboard. sql at main · qanhnn12/SQL-Hackerrank-Challenge-Solutions Contains solutions for all Hackerrank Sql problems - Hackerrank-Sql-solutions/Basic Join -- Population Census at main · vmlrj02/Hackerrank-Sql-solutions Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. -- 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. This repository contains my solutions to all SQL challenges on HackerRank. score = d. difficulty_level inner join hackers h on s. You switched accounts on another tab or window. -- If more than one wand has same power, sort the result in order of descending age 317 efficient solutions to HackerRank problems. country_code matches country. - SQL-Hackerrank-Challenge-Solutions/Basic Join/Contest-Leaderboard. If more than one student created the same select h. roll_number having sum(b. HackerRank SQL Challenge Solutions . Grade, Students. Write a query to print the hacker_id, name, and total score of the hackers ordered by the descending score. Sr No Challenges Language Solution Skills; 1: Population Census: MySQL: Population-Census: Basic: 2: African Cities: MySQL: African-Cities: Basic: 3: Average Population of Each Continent: Contains solved queries for the Hackerrank SQL (Basic) Skills Certification Test 🎓. marks between grades. SELECT IF (GRADE < 8, NULL, NAME), GRADE, MARKS FROM STUDENTS JOIN GRADES WHERE MARKS BETWEEN MIN_MARK AND MAX_MARK ORDER BY GRADE DESC, NAME. college_id = clg. subject_one + em. subject_one + Contains solved queries for the Hackerrank SQL (Basic) Skills Certification Test 🎓. Test duration 30 mins. com/raj713335/Solve-SQL-HackerRank/blob/main/Basic%20Join/07%20Challenges 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. SQL Population Census - Summary. If more than one hacker achieved the same total score, then sort the Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Whether we are beginners or experienced professionals, practicing SQL exercises is important for improving your skills. Learn more. name. Ketty gives Eve a task to generate a report containing three columns: Name, Grade and Mark. Solution-2: Using INNER JOIN, HAVING & SUB-QUERY (MySQL Query): select country. hackerrank. 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. Hermione decides the best way to choose is by determining the minimum number of gold galleons needed to buy each non-evil wand of high power and age. Instructions. - adminazhar/hackerrank-SQL-basic-skills-certification-test-solution Basic Join. Mustafa Germec. challenge_id = c. Order your output in descending order by the total number of challenges in which the hacker earned a full score. Submissions. The mapping between SELECT CASE WHEN Grades. Introduction to SQL. roll_number = b. The two tables are linked through the country code, where city. Here's my Hackerrank Solutions. 5:; SELECT CO. 8223 words 42 min read ––– views. In this tutorial, we will perform a population census using SQL by joining the city and country tables available on HackerRank. Welcome to HackerRank SQL (Basic) Skills Certification Test. Sort your results by the total number of challenges in descending order. Please signup or login in order to view this challenge. I have tried to provide the complete solution with possible explanation to all SQL Practice problem on HackerRank. hacker_id, h. Ketty doesn't want the NAMES of those students who received a grade lower than 8. college_id LEFT JOIN A lesson that teaches you how to solve the following problem from the SQL section in HackerRank. difficulty_level = d. - Hackerrank-SQL-Basic-Skills-Certification-Test-Solutions/Student_ Advisor_SQL. You signed in with another tab or window. Julia asked her students to create some coding challenges. After applying cross_join on table s and e, you will get all Contribute to vrushalird/HackerRank-SQL-Solutions development by creating an account on GitHub. by. Solved queries for the Hackerrank SQL (Basic) Skills Certification Test 🎓. actually ends up doing a join. 5 to round down all values even if its greater than 0. African Cities. The solutions of all SQL hackerrank challenges using MySQL environment - padhs/HackerRank-SQL-sol. sql at main · Surabhi195/HackerRank-SQL-Challenges-Solutions Hello coders, in this post you will get all the solution of HackerRank SQL Solutions. The solutions of all the SQL challenges for all easy, medium and hard challenges on HackerRank executed on MySQL environment. com/challenges/african-citiesLearn: B HackerRank: SQL - All solutions (Basic Select, Advanced Select, Aggregation, Basic Join, Advanced Join, Alternative Queries) Coursera: Machine Learning (Week 2) [Assignment Solution] - Andrew NG Coursera: Machine Solutions for all SQL challenges on HackerRank executed on MySQL and MS SQL Server. subject_one + b. hacker_id JOIN Hello coders, in this post you will get all the solution of HackerRank SQL Solutions. Contribute to chanwaihan/HackerRank-Solutions development by creating an account on GitHub. Ollivander's Inventory. sql at main · chibui191/HackerRank_SQL_Solutions The solutions of all SQL hackerrank challenges using MySQL environment - HackerRank-SQL-Challenges-Solutions/Basic Join/Challenges. You signed out in another tab or window. . SQL (Basic) Skills Certification Test. The report must be in descending order by grade -- i. score and c. subject_three) < 100 My solutions to HackerRank practice problems. -- HackerRank Note: -- - MUST USE MS SQL SERVER To use CTEs with MySQL. Saved searches Use saved searches to filter your results more quickly My solutions to HackerRank's challenges in the SQL Preparation Kit - HackerRank_SQL_Solutions/Basic Join/population_census. - JawadSher/SQL-Problems-Solutions-HackerRank Basic Join. Example Task: Install a relational database (e. Contribute to sknsht/HackerRank development by creating an account on GitHub. CountryCode and COUNTRY. Articles Works Shiny Snippets Resume About Contact. HackerRank concepts & solutions. - SQL-Hackerrank-Challenge-Solutions/Basic Join/African-Cities. Basic SQL Queries Basic Join. -- Note: CITY. In select, apply case clause for students. code group by country. FLOOR function is used to round down the decimal number to the nearest integer (smaller than or equal to the input number. - HackerRank-solutions/Sql/Basic Join/Contest Leaderboard. Ketty doesn’t want the NAMES of those students who received a grade lower than 8. The CITY and COUNTRY tables are described as follows:. This is the only video you will need to improve you Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. No. com/domains/sql_____ SUBSCRIBE!Do you want to understa The HackerRank SQL Advanced Certification is a great way to showcase your SQL expertise. roll_number group by em. https://www. Marks FROM Students JOIN Grades ON Students. DevSecOps DevOps CI/CD View all use cases By industry. Min_Mark AND Grades. HackerRank-Solutions / sql / intermediate / basic-join / the-report. sql at main · chibui191/HackerRank_SQL_Solutions Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Wands_Property: The code is the code of the wand, age is the age of the wand, and is_evil denotes whether the wand is good for the dark arts. Sort by. Order By grades. difficulty_level group by h. txt at main · mahedei/Hackerrank-SQL-Basic-Skills-Certification-Test-Solutions Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. SQL Problem Statement: Samantha interviews many candidates from different colleges using coding challenges and contests. name FROM student_information a INNER JOIN examination_marks b ON a. countrycode = country. Welcome to the HackerRank SQL Challenges Solutions repository! This repository contains my solutions to all the HackerRank SQL Practice Questions. It focuses solely on offering correct answers for SQL queries, joins, and aggregations, helping users pass the certification efficiently. FLOOR(2. Name END, Grades. The questions typically involve retrieving data from multiple tables, using conditions to filter results, and employing functions like GROUP BY and ORDER BY. continent, floor(avg(city. roll_number = em. Contains solved queries for the Hackerrank SQL (Basic) Skills Certification Test 🎓. continent A lesson that teaches you how to solve the following problem from the SQL section in HackerRank. hacker_id = c. mysql at master · rutujar/HackerRank-solutions SQL. select CO. Sign in Basic Join. roll_number Having Sum(em. Repo gathered by CodeRankGPT - Solve HackerRank coding problems during your coding interview, in real-time and undetectable 😎 from student_information si inner join examination_marks em on si. My solutions to HackerRank's challenges in the SQL Preparation Kit - HackerRank_SQL_Solutions/Basic Join/the_report. SQL. e. sql. If there is more than one student with the same grade (8-10) assigned to them, order those particular You signed in with another tab or window. Sort your results by the total number of challenges in descending order. My solutions of all the SQL challenges for all easy, medium and hard challenges on HackerRank. HackerRank solutions. Add a description, image, and links to the hackerrank-sql-solutions topic page so that developers can more easily learn about it. 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. Whether you're a beginner or an experienced developer, you'll find solutions and explanations for everything from basic queries to advanced data manipulation. CONTINENT, ROUND(AVG(C. sql at main · qanhnn12/SQL-Hackerrank-Challenge-Solutions HackerRank: SQL - All solutions (Basic Select, Advanced Select, Aggregation, Basic Join, Advanced Join, Alternative Queries) by Akshay Daga (APDaga)-April 22, 2021. The execution sequence for first and second solution by @alexbelenov is same with time complexity (n sqaured) Join us Create a HackerRank account Be part of a 23 million-strong community of developers. This was curated after solving all 58 questions, and achieving a score of 1130 points (WR1) SUM(views. JOIN and INNER JOIN are the same in SQL. This Repository contain solutions to HackerRank 30 Days Of Code Challenge, 10 days of javascript,10 days of statistics,java,sql. hacker_id = t2. Code are matching key columns 317 efficient solutions to HackerRank problems. san28v. It returns the records that have matching values in both tables. 902 | You signed in with another tab or window. name from student_information a inner join examination_marks b on a. Join us Create a HackerRank account Be part of a 23 million-strong community of developers.