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