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