Hackerrank sql We use cookies to ensure you have the best Introduction to SQL. Readme Activity. Choose from different levels of difficulty and topics, such as select query, join, and weather observation Take a 30-minute test to verify your SQL skills and get highlighted to companies. We use cookies to ensure you have the best Medium SQL (Intermediate) Max Score: 30 Success Rate: 96. to. Harry Potter and his friends are at Ollivander’s with Ron, finally replacing Charlie’s old broken wand. 175. these errors. select round (AVG(population)) from CITY ; 0 | Permalink. Weather Observation Station 19. hackerrank-sql Star HackerRank is a tech company that focuses on competitive programming challenges for both consumers and businesses, where developers compete by trying to program according to provided specifications. , a, e, i, o, and u) as both their My solution in SQL Server: SELECT id , age , coins_needed , power FROM ( SELECT W . Easy SQL (Basic) Max Score: 10 Success Rate: 99. Write a query to output the names of those students whose best friends got offered a higher SQL. 83%. Learn how to solve database questions on HackerRank using SQL, MySQL, PostgreSQL, DB2, or Oracle. Population Census . Watchers. Revising the Select Query II. No description, website, or topics provided. Activities involved: Setting up a database environment and understanding SQL’s purpose and use cases. Join over 16 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. 2345, rounded to 4 decimal places. If there is more than one smallest or largest city, choose the one that comes first when Find the difference between the total number of CITY entries in the table and the number of distinct CITY entries in the table. Japanese Cities' Names. We use cookies to ensure This repository contains all solutions and "thought process" to Hackerrank's SQL challenges. Ketty gives Eve a task to generate a report containing three columns: Name, Grade and Mark. 04%. 4 Star - Silver. , MySQL, PostgreSQL) and connect to it using a SQL client. Load more conversations. Learn about the test format, topics, and benefits of becoming a HackerRank verified developer. 1 watching. Query the list of CITY names starting with vowels (i. com practice problems in C++, python and SQL - IhorVodko/Hackerrank_solutions SQL (Structured Query Language) is a powerful tool used for managing and manipulating relational databases. 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. We use cookies to ensure you have the best Medium SQL (Intermediate) Max Score: 20 Success Rate: 96. We use cookies to ensure you have the best Hard SQL (Intermediate) Max Score: 50 Success Rate: 85. This repository contains SQL queries for various problems solved on HackerRank. My SQL select distinct CITY from STATION Where SUBSTR(CITY, LENGTH(CITY), 1) NOT IN ('a','e','i','o','u'); 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 Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. countrycode = CO. SP2-0042: unknown command ")" - rest of line ignored. In. Students contains three columns ID, Name and Marks. They are essential for building more sophisticated and robust queries, managing data relationships, and In this post, I’ll share my solutions to some SQL problems on HackerRank, categorized as “Easy. We use cookies to ensure You signed in with another tab or window. Overview. HackerRank SQL Solutions. Submissions. Aggregation. 21 stories SQL. akshithalachu68. Reason: Fundamental setup and understanding are necessary to start writing SQL queries. 0 forks. Devrim Ozcay. Friends contains two columns: ID and Friend_ID (ID of the ONLY best friend). Blog; Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. 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 Write a query to print the shortest and longest length city name along with the length of the city names. Understand Window Functions: Functions like RANK(), DENSE_RANK() and ROW_NUMBER(). sql at master · Shounok/hackerrank-sql-solutions SQL. SQL (Intermediate) SQL (Advanced) Difficulty. Problem. Skills SQL (Intermediate) SQL (Advanced) Difficulty. Starts in. Medium SQL (Basic) Max Score: 25 Success Rate: 98. 02%. We use cookies to ensure you SQL. find total number of view, total number of unique views, total number of submissions and total number of accepted submissions. Note: Print NULL when there are no more names corresponding to an occupation. 49%. for ms sql SELECT CEILING(AVG(POPULATION)) FROM CITY. recency | 809 Discussions| Please Login in order to post a comment. 65%. We use cookies to ensure SQL (Intermediate) SQL (Advanced) Difficulty. select name from city where population>120000 and countrycode ='usa'; SQL (Intermediate) SQL (Advanced) Difficulty. Leaderboard. We use cookies to ensure you Medium SQL (Intermediate) Max Score: 20 Success Rate: 96. If the city name is repeated in any row that also be counted . 82%. Oracle SQL specifically. e. Amber’s conglomerate corporation just acquired some new companies. Packages contains two columns: ID and Salary (offered salary in $ thousands per month). 0 | Parent Permalink. We use cookies to ensure you have the best Query the list of CITY names ending with vowels (a, e, i, o, u) from STATION. We use cookies to ensure you have Easy SQL (Intermediate) Max Score: 30 Success Rate: 94. Medium. Before You Launch. You switched accounts on another tab or window. They are essential for building more sophisticated and robust queries, managing data relationships, and optimizing query performance. Solved. code , W . SQL (Basic) SQL (Intermediate) SQL (Advanced) Difficulty. 5 Star - Gold. Learn how to use them effectively with the OVER They are necessary for optimizing performance, managing complex queries, ensuring data integrity, and leveraging advanced features for high-level query design and development. We use cookies to ensure you have the best browsing experience on our website. The output column headers should be Doctor, Professor, Singer, and Actor, respectively. Medium SQL (Intermediate) Max Score: 20 Success Rate: 96. We use cookies to in oracle . 03%. Grades contains the following data:. Create a HackerRank account Be part of a oracle: with t1 as ( select level lvl from dual connect by level <= 20 order by level desc ) select rpad('* ', lvl*2, '* ') from t1; Query all columns for every row in a table. Whether we are beginners or experienced professionals, practicing SQL exercises is important for improving HackerRank SQL Problems and Solutions — 1. SQL SERVER (Alternative of distinct) HackerRank SQL Solutions This repository contains solutions to various SQL challenges and problems solved on HackerRank. You are given two tables: Students and Grades. code group by continent ; 0 | Parent Permalink. 15 Days of Learning SQL. In this blog post, I’ll be going through Weather Observation Station 6–10. Reload to refresh your session. Hard SQL (Advanced) Max Score: 50 Success Rate: 78. continent, round(avg(C. Select All. Test your SQL skills with HackerRank, a platform for coding challenges and interviews. About. We use cookies to ensure you have Medium SQL (Intermediate) Max Score: 30 Success Rate: 96. This is the only video you will need to improve you HackerRank SQL Problems and Solutions — 1. Hi i excited tell about SQL basic queries that using for databases Problem. Medium SQL (Intermediate) Max Score: 30 Success Rate: 96. : number of characters in the name). recency | 486 Discussions| Please Login in order to post a comment. recency | 499 Discussions| Please Login in order to post a comment. 7 hours ago + 0 comments. Sql - Badge Level. Please signup or login in order to view this challenge. company_code Verify your SQL Skills. Revising the Select Query I – HackerRank Solution Verify your SQL Skills. Basic SQL Queries SQL. Also, a full solution without the need to change modes was posted by @dougal_michael below, which uses the MIN() function instead. recency | 899 Discussions| Please Login in order to post a comment. Greetings! Welcome back to the Hackerrank SQL guide. id , WP . hacker_id, name ) select hackerid, name, cnt from comp where hackerid not in (select hackerid from comp where cnt in SQL (advanced) certificate . lead_manager_code) AS Total Lead Manager, COUNT(DISTINCT SM. You signed out in another tab or window. Points Needed. They are necessary for optimizing performance, managing complex queries, ensuring data integrity, and leveraging advanced features for Join over 16 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Forks. by. By detailing sales figures per city and identifying customers who spent 25% or less than the average, this solution aids in strategic decision-making for optimizing sales and customer engagement. We use cookies to ensure SQL. We use cookies to Medium SQL (Intermediate) Max Score: 20 Success Rate: 96. The OCCUPATIONS SQL. power , ROW_NUMBER () OVER ( PARTITION BY W . We use cookies to ensure you SELECT C. We use cookies to ensure you Medium SQL (Intermediate) Max Score: 30 Success Rate: 96. founder, COUNT(DISTINCT LM. presents. Weather Observation Station 16. We use cookies to SQL (Intermediate) SQL (Advanced) Difficulty. Skills. You are registered for the contest. 1 Star - Bronze. Input Format. Visit the website for more information. hacker_id as hackerid, name, count(c. We use cookies to ensure you have 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 you These are the most common problems we encounter while integrating the Traffic Rider SQL to look into the matter. We use cookies to ensure Hello coders, in this post you will get all the solution of HackerRank SQL Solutions. 80. Pivot the Occupation column in OCCUPATIONS so that each Name is sorted alphabetically and displayed underneath its corresponding Occupation. Stars. SQL Window Functions with Examples -Part 1. You are given three tables: Students, Friends and Packages. Easy SQL (Basic) Max Score: 10 Success Rate: 98. They use their knowledge of statistical analysis, data modeling, and data visualization to provide insights that help businesses make informed decisions. Basic Select. Accelerate your Job Search. Create a HackerRank account Medium SQL (Intermediate) Max Score: 30 Success Rate: 97. hacker_id=h. Unsolved. If you’re new then welcome on board. 3 hours ago + 0 comments. The COUNTRYCODE for Japan is JPN. tnguyen29. Medium SQL (Intermediate) Max Score: 30 Success Rate: 97. Medium SQL (Basic) Max Score: 30 Success Rate: 93. 1 week ago + 0 comments. Discussions. The goal of this repository is to document and share SQL queries that I have implemented to solve real-world scenarios and coding challenges. Tweet it Share it. Alternative Queries. The PADS. We use cookies to Easy SQL (Intermediate) Max Score: 30 Success Rate: 94. We use cookies to ensure Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. 71%. hacker_id group by c. 60%. We use cookies to ensure you Medium SQL (Intermediate) Max Score: 30 Success Rate: 97. where LAT_N is the northern latitude and LONG_W is the western longitude. Easy SQL (Intermediate) Max Score: 30 Success Rate: 94. 06%. hacker_id) cnt from challenges c inner join hackers h on c. So, without wasting any time, let’s jump to the solutions. senior_manager_code) AS Total Senior Manager, COUNT(DISTINCT M. Status. The STATION table is described as follows:. These questions not only tested my technical skills but also challenged me to think critically. population),0) from city C join country CO on C. Revising the Select Query I. mysql sql hackerrank learning-exercise hackerrank-solutions hackerrank-sql hackerrank-sql-challenge upskilling certify-maintenance hackerrank-sql-certificate find users who submitted a query every day. Hard SQL (Intermediate) Max Score: 50 Success Rate: 85. employee_code) AS Total Employee FROM Company C LEFT JOIN Lead_Manager LM ON LM. There are a total of 58 problems of varying difficulty level that test different concepts. Tutorial Badges. Hard. We use cookies to ensure you This intermediate SQL solution provides insights into product sales across cities, offering a comprehensive overview of customer spending patterns. g. 68%. 99%. The solutions of all the SQL challenges for all easy, medium and hard challenges on HackerRank executed on MySQL environment. 15%. Hermione decides the best way to choose is by determining the minimum number of gold galleons needed to buy each non TCS Xplore Hackathon Java - Hackerrank SQL, Unit - Hackerrank Activities - SQL, TCS Xplore Assesment, Know your TCS, Final Assesment Answers, Business Skills, Hackathon Java, Hackerrank Java, AsCEnD Certification Courses, AsCEnD BigData, AsCEnD Datawarehouse, AsCEnD Azure Cloud, AsCEnD Machine Learning, Game of Skills 2020, AsCEnD Angular2 Medium SQL (Intermediate) Max Score: 30 Success Rate: 97. Weather Observation Station 8. change to MS SQL SERVER . We use cookies to ensure you have the SQL (Intermediate) SQL (Advanced) Difficulty. age , W . Weather Observation Station 20. We use cookies to ensure Easy SQL (Intermediate) Max Score: 30 Success Rate: 94. Follow the steps to set up your environment, write your query, test your code, and submit your answer. Easy SQL (Advanced) Max Score: 25 Success Rate: 96. Query the NAME field for all American cities in the CITY table with populations larger than 120000. These concepts introduce more complex features and functionalities of SQL. We use cookies to ensure you SQL (Intermediate) SQL (Advanced) Difficulty. Hi i excited tell about SQL basic queries that using for databases SQL (Intermediate) SQL (Advanced) Difficulty. We use cookies to Hard SQL (Intermediate) Max Score: 50 Success Rate: 85. SP2-0734: unknown command beginning "FROM cte c" - SQL (Intermediate) SQL (Advanced) Difficulty. recency | 5292 Discussions| Please Login in order to post a comment. 74%. We use cookies to Amber's conglomerate corporation just acquired some new companies. Easy. s2020266050. Links to the first part and second parts in this series can be found here: Part I and Part II. SQL. 300. Create a HackerRank account The HackerRank SQL Advanced Certification is a great way to showcase your SQL expertise. 9 hours ago + 0 comments. select CO. The CITY table is described as follows: Author. For example, if there are three records in the table with CITY values 'New York', 'New York', 'Bengalaru', there are 2 different city Easy SQL (Advanced) Max Score: 25 Success Rate: 97. Lists. 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. prakulbagchi. Sep 15, 2024. ” I used the MySQL option on the platform to solve each of the challenges. Hackerrank is a great platform to practice SQL queries. Problem 1. Advanced Select. 50%. recency | 850 Discussions| Please Login in order to post a comment. SP2-0734: unknown command beginning "ELSE (SELE" - rest of line ignored. Going through them greatly improved my ability Tips for Passing the HackerRank SQL Advanced Certification. ChatGPT. 97%. We use cookies to ensure you Easy SQL (Intermediate) Max Score: 30 Success Rate: 94. HackerRank SQL Problems and Solutions — 1. Practice You might like to solve practice problems on HackerRank. Contribute to katehee/HackerRank-SQL-certificate development by creating an account on GitHub. bharathiraja0071. Query the details of the city with ID 1661. New Companies. Problem Edits: Updated with the sql_mode='' based on @jakab922's comment. coins_needed , W . I hope this Query the two cities in STATION with the shortest and longest CITY names, as well as their respective lengths (i. 2 days ago + 0 comments. 650. Query the list of CITY names from STATION which have vowels (i. It is organized into six folders, each containing my solutions for easy, medium and difficult challenges executed in About. 2 Star - Bronze. recency | 2374 Discussions| Please Login in order to post a comment. Solve Challenge. Order Welcome to the HackerRank SQL Solutions Repository! This repository contains my solutions to various SQL challenges from HackerRank. Solve problems related to drawing triangles, printing prime numbers and more on HackerRank. SELECT DISTINCT(CITY) FROM STATION WHERE MOD (ID,2) = 0; 1 | Permalink. 14%. HackerRank's programming challenges can be solved in a variety of programming languages (including Java, C++, PHP, Python, SQL Why this video is 7. 48%. I do not own or make these questions. Example Task: Install a relational database (e. Ketty doesn't want the NAMES of those students who received a grade lower than 8. 0 stars. Editorial. Query all columns (attributes) for every row in the CITY table. thank you so much! really helped. shivanisingh1992. Employee Names. Top Competitors. We use cookies to ensure you Write a query to print the sum of LAT_N and the sum of LONG_W separated by space, rounded to 2 decimal places. , a, e, i, o, or u) from STATION. 85%. Subdomains. We use cookies to ensure you Pivot the Occupation column so the Name of each person in OCCUPATIONS is displayed underneath their respective Occupation. We use cookies to Medium SQL (Intermediate) Max Score: 30 Success Rate: 97. 66%. select distinct city from station where NOT (REGEXP_LIKE(SUBSTR(CITY, 1, 1), '^[AEIOUaeiou]') AND REGEXP_LIKE(SUBSTR(CITY, -1, 1), '[AEIOUaeiou]$')) order by city; The solution pass the test but In my solutions i have several problems : Create a HackerRank account Be part of a 23 million-strong community of Why doesn't below query works for sql server ? select distinct city from station where not city like '[aeiou]%[aeiou]'; 0 | Permalink. Data analysts are responsible for collecting, analyzing, and interpreting large datasets to identify patterns and trends. 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 all the Japanese cities in the CITY table. You can tell your friends about SQL. It will be updated everyday. Your result Effective solutions to hackerrank. tried this in oracle: with comp as ( select c. We use cookies to ensure you Easy SQL (Advanced) Max Score: 25 Success Rate: 97. 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 SQL. Print the total number of challenges created by hackers. We use cookies to ensure you select city from station where city like 'A%' or city like 'E%' or city like 'I%' or city like 'O%' or city like 'U%'; Query the Western Longitude for the largest Northern Latitude under 137. 57%. kavithasachin26. Let’s begin. recency | 1420 Discussions| Please Login in order to post a comment. . Students contains two columns: ID and Name. 3 Star - Silver. Advanced Join. COUNT is the aggregate Funtion that used to count the number of rows in a table. I DID THE SAME THING HACKERRANK MF IS SHOWING COMPLIATION ERROR . recency | 2227 Discussions| Please Login in order to post a comment. SQL Basic Queries. 450. We use cookies to ensure you Query CITY names that start AND end with vowels. nguyenx8student. 4 weeks ago + 0 comments. 5 hours long? Because Im solving ALL of the SQL Problems on Hackerrank in this video. power DESC ) AS RowNumber FROM Wands W WITH ( NOLOCK ) INNER JOIN Wands_Property WP WITH ( NOLOCK ) ON W . Sort by. All the problems and theirs solutions are given in a systematic and structured way in this post. The table we’ll be using is the station table shown below: Problem. COUNT(city) will count the number of row If it has city column and has value. HackerRank changed the default sql_mode behavior to only_full_group_by at some point after I posted this. woxinweilan. Though many experts are attempting to resolve the problem, none of The repository dedicated to solutions for Hacker-rank Database problems, solved with MySQL - hackerrank-sql-solutions/The PADS. The README file provides problem descriptions, solution approaches, and notes for each file. Medium SQL (Intermediate) Max Score: 40 Success Rate: 95. Easy SQL (Basic) Max Score: 10 Success Rate: 95. Shaloo Mathew. This ultimate guide is a complete overview of the types of SQL Join over 11 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. The report must be in descending order by grade My SQL. Draw The Triangle 2. The case (uppercase or Test your SQL skills with 15 days of learning and three challenges of different difficulty levels. Weather Observation Station 18. recency | 1006 Discussions| Please Login in order to post a comment. Create a HackerRank account Be part of a 23 million-strong community of developers. Please read our cookie policy for Explore HackerRank SQL Solutions, a robust resource offering a diverse array of practical challenges and expert solutions to bolster your SQL proficiency and database querying skills. code = WP . company_code, C. Create a HackerRank account HackerRank SQL Problems and Solutions — 1. We use cookies to ensure you Problem. for oracle. 95%. Basic Join. kanyarasit. The CountryCode for America is USA. 39%. 2 weeks ago + 0 comments. Draw The Triangle 1. Print Prime Numbers. We use cookies to ensure you have the best SQL (Intermediate) SQL (Advanced) Difficulty. Binary Tree Nodes. Weather Observation Station 6. manager_code) AS Total Manager, COUNT(DISTINCT E. power ORDER BY W . Revising Aggregations - The Count Function. Info; Rules; Scoring Welcome to the HackerRank SQL Challenges Solutions repository! This repository contains my solutions to all the HackerRank SQL Practice Questions. We use cookies to ensure you have the best Hard SQL (Advanced) Max Score: 50 Success Rate: 78. This query works in sql developer and doesn't work in hackerrank with . These concepts require a deeper understanding of SQL and its ecosystem. -- ORACLE SQL. 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. 0 | Permalink. Resources. Population Density Difference. African Cities. Medium SQL (Advanced) Max Score: 40 Success Rate: 93. 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. 98%. bim iju gayhqj wvkypb ybqavk kpzcxv kdsqnyh jdpm otql djcduv