Sql in hackerrank SQL Basic Queries. Please signup or login in order to view this challenge. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems. g. Ketty gives Eve a task to generate a report containing three columns: Name, Grade and In this post, we will be covering all the solutions to SQL on the HackerRank platform. We use cookies to ensure Hard SQL (Advanced) Max Score: 50 Success Rate: 78. Adi HackerRank SQL Problems and Solutions — 1. com practice problems in C++, python and SQL - IhorVodko/Hackerrank_solutions SQL interview questions have been a critical component of technical hiring for decades. Each of the companies follows this hierarchy: Given the table schemas below, write a query to print the company_code, founder name, for oracle. Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Challenges: 21, Attempts: 1019923, Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Last updated 1/2025. Take the HackerRank Certification Test and showcase your knowledge as a HackerRank verified developer. The goal of this repository is to document and share SQL queries that I have implemented to solve real-world scenarios and coding challenges. Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. ” I used the MySQL option on the platform to solve each of the challenges. Medium SQL (Basic) Max Score: 25 Success Rate: 98. We use cookies to ensure you have the best browsing experience on our website. 85%. We use cookies to ensure you These concepts require a deeper understanding of SQL and its ecosystem. Advanced Join. Table of Contents. New Companies. 0 | Permalink Create a HackerRank account Be Medium SQL (Intermediate) Max Score: 30 Success Rate: 97. Solve Challenge. SQL (Intermediate) SQL (Advanced) Difficulty. You are given two tables: Students and Grades. 65%. shivanisingh1992. hacker_id as hackerid, name, count(c. We use cookies to ensure you have the best SQL (Intermediate) SQL (Advanced) Difficulty. Whether we are beginners or experienced professionals, practicing SQL exercises is important for for ms sql SELECT CEILING(AVG(POPULATION)) FROM CITY. 4 weeks ago + 0 comments. A median is defined as a number separating the higher half of a data set from the lower These are the most common problems we encounter while integrating the Traffic Rider SQL to look into the matter. We use cookies to ensure you have the best Easy SQL (Intermediate) Max Score: 30 Success Rate: 94. 76%. Sep 16, 2024. 15%. We use cookies to The various MySQL certifications cover topics such as SQL, data modeling, database administration, connectors, APIs, schema objects, and transactions. challenge_id) as cnt from ( Select s. Accelerate your Job Search. hacker_id=h. for oracle. We use cookies to Hard SQL (Intermediate) Max Score: 50 Success Rate: 85. 1 Week Preparation Kit. Unsolved. In. Area 1 - Basic SQL Queries Interviews can be hands-on, with problems to solve on CoderPad, HackerRank, or even a Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Discussions. Weather Observation Station 1. Get silver and gold rank with 600+ points. Alternative Queries. We use cookies to ensure Join over 16 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Hard SQL (Advanced) Max Score: 50 Success Rate: 78. In this post, I’ll share my solutions to some SQL problems on HackerRank, categorized as “Easy. This is the only video you will need to improve you Easy SQL (Intermediate) Max Score: 30 Success Rate: 94. Example Task: Install a relational database (e. Problem; Solution – Print Prime Numbers in SQL | Hacker Rank Solution. 4 Star - Silver. Join over 16 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. 74%. 48%. where LAT_N is the northern latitude and LONG_W is the western Easy SQL (Intermediate) Max Score: 30 Success Rate: 94. 82%. Grades contains the following data:. Create a HackerRank account Be part of a 23 million-strong community of developers. Going through them greatly Hard SQL (Intermediate) Max Score: 50 Success Rate: 85. Learn SQL queries, aggregations, joins, subqueries, and more with examples and explanations. select * from CITY;-2 | Permalink. The Name column only contains uppercase (A-Z) and lowercase (a-z) letters. Though many experts are attempting to resolve the problem, none of HackerRank SQL. We use cookies to ensure you have SQL (Intermediate) SQL (Advanced) Difficulty. Query the list of CITY names starting with vowels (i. Print Prime Numbers. 3 Star - Silver. Skills. Tutorial Badges. Advanced Select. Join over 23 million developers in solving code challenges on HackerRank, one of the best ways SQL. hacker_id) cnt from challenges c inner join hackers h on c. Skills Write a query identifying the type of each record in the TRIANGLES table using its three side lengths. MySQL Server; Problem. We use cookies to Problem. The IN operator allows you to specify multiple values in a WHERE clause. Pivot the Occupation column in OCCUPATIONS so that each Name is sorted alphabetically and displayed underneath its corresponding Occupation. population),0) from city C join country CO on C. What you really want to do is test job interview questions Find all the solutions of HackerRank SQL problems in a systematic and structured way. 57%. You signed out in another tab or window. We use cookies to ensure you have That’s all I can share to solve some problems in SQL HackerRank (Difficulaty Easy). The PADS. You are given a table, Projects, containing three columns: Task_ID, Start_Date and End_Date. Problem 1. We use cookies to ensure Medium SQL (Intermediate) Max Score: 30 Success Rate: 96. Mar 31, 2024. For example: The HackerRank SQL Advanced Certification is a great way to showcase your SQL expertise. Some companies use tools like Hackerrank to screen, some use it to evaluate talent at a higher level, some use it to build a HackerRank SQL Problems and Solutions — 1. Medium. See all from Isabelle. 650. , a, e, i, o, or u) from STATION. Verify your SQL Skills. You are given three tables: Students, Friends and Packages. Harry Potter and his friends are at Ollivander’s with Ron, finally replacing Charlie’s old broken wand. tymoshchuk_teti1. Medium SQL (Intermediate) Max Score: 30 Success Rate: 97. Medium SQL (Advanced) Max Score: 40 Success Rate: 93. akshithalachu68. Hermione decides the best way to choose is by determining the minimum number of gold galleons needed to buy each Medium SQL (Intermediate) Max Score: 30 Success Rate: 96. They are essential for building more sophisticated and robust queries, managing data relationships, and optimizing query performance. SQL Query for printing prime numbers. Sort by. Visit the website for more information. 2345, rounded to 4 decimal places. 2 Star - Bronze. score as _score, difficulty_level, s. 5 Star - Gold. SQL (Structured Query Language) is a powerful tool used for managing and manipulating relational databases. Rating: 4. We use cookies to ensure you Query the two cities in STATION with the shortest and longest CITY names, as well as their respective lengths (i. 97%. It is very important that you all first give it SQL (Intermediate) SQL (Advanced) Difficulty. 49%. , MySQL, PostgreSQL) and connect to it using a SQL client. 7 (97 ratings) 15,061 students. ; Isosceles: It's Greetings! Welcome back to the Hackerrank SQL guide. tried this in oracle: with comp as ( select c. Top Earners. SELECT CEIL((AVG(salary)) - (AVG(REPLACE(salary, '0', '')))) AS avg_salary FROM employees; That is why i provided the whole solution and clarification to the hackerrank problem in SQL server. It is guaranteed that the difference between the End_Date and SQL. Start learning SQL now » select city from station where city like 'A%' or city like 'E%' or city like 'I%' or city like 'O%' or city like 'U%'; These concepts introduce more complex features and functionalities of SQL. The STATION table is described as follows:. Join us Create a HackerRank account Be part of a 23 million-strong community of developers. 4. We use cookies to Medium SQL (Intermediate) Max Score: 20 Success Rate: 96. We use cookies to Julia conducted a days of learning SQL contest. English. We use cookies to ensure you Easy SQL (Intermediate) Max Score: 30 Success Rate: 94. Annotated solutions to HackerRank's SQL domain questions. We use cookies to SQL (Intermediate) SQL (Advanced) Difficulty. hacker_id group by c. Friends contains two columns: ID and Friend_ID (ID of the ONLY best friend). Hopefully it can be understood, if there is a response, please leave it in the Find the difference between the total number of CITY entries in the table and the number of distinct CITY entries in the table. But it's still mostly rote syntax that you'll learn. select name from city where population>120000 and countrycode ='usa'; While solving all SQL problems from HackerRank, I came across multiple solutions for the same problem. kavithasachin26. Points Needed. We use cookies to ensure you SQL is a standard language for storing, manipulating and retrieving data in databases. 7 hours ago + 0 comments. : number of characters in the name). If there is more than one smallest or largest city, choose the one that comes first PL/SQL is an extension of SQL language that combines the data manipulation power of SQL with the processing power of procedural language to create super-powerful SQL queries. If the End_Date of HackerRank concepts & solutions. What you'll learn. Revising the Select Query II. We use cookies to Why this video is 7. 03%. To query just the names of all Japanese cities from the CITY table, where the COUNTRYCODE for Japan is 'JPN', you can use the following SQL query: SELECT NAME FROM CITY WHERE CountryCode = 'JPN' ; In this query: - SELECT NAME specifies that you only want to retrieve the NAME field from the CITY table. Medium SQL (Intermediate) Max Score: 30 Success Rate: 96. Create a HackerRank account Be part of a The SQL IN Operator. Regex. hacker_id, name ) select hackerid, name, cnt from comp where hackerid not in (select hackerid from comp where cnt in Easy SQL (Intermediate) Max Score: 30 Success Rate: 94. Your result Print the names of employees who earn more than $2000 per month and have worked at the company for less than 10 months. SQL (Basic) SQL (Intermediate) SQL (Advanced) Difficulty. select round (AVG(population)) from CITY ; 0 | Permalink. English [Auto] Preview this course. challenge_id) j INNER JOIN Difficulty d Problem Statement: Julia conducted a days of learning SQL contest. Approaching it the right way, everyone with basic Easy SQL (Advanced) Max Score: 25 Success Rate: 97. - HackerRank-SQL/Occupations. 300. Return to all comments → The Problem You are given a table, Projects, containing three columns: Task_ID, Start_Date, and End_Date. You switched accounts on another tab or window. Why doesn't below query works for sql server ? select distinct city from station where not city like '[aeiou]%[aeiou]'; 0 | Permalink. Return to all comments → SQL. Sep 15, 2024. The start date of the contest was March 01, 2016 and the end date was March 15, 2016. Student and Friend Salary Report: Insights and Analysis. Each solution includes a brief explanation of the problem and my approach to solving it. Write a query to find the maximum total earnings for all 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. Directions: Query the Name of any student in STUDENTS who scored higher than Marks. 02%. These questions not only tested my technical skills but also challenged me to think SQL (Intermediate) SQL (Advanced) Difficulty. Also, a full solution without the need to change modes was posted by @dougal_michael below, which uses the MIN() function instead. Create a HackerRank account Hello coders, in this post you will get all the solution of HackerRank SQL Solutions. Query the Western Longitude for the largest Northern Latitude under 137. ChatGPT. The output column headers should be Doctor, Professor, Singer, The goal of /r/SQL is to provide a place for interesting and informative SQL content and discussions. Create a HackerRank account Here is the solution (MySQL) for Hackerrank challenge The Blunder. 1 month ago + 0 comments. by. select AVG(population) from CITY where district ='California'; Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Aggregation. HackerRank changed the default sql_mode behavior to only_full_group_by at some point after I posted this. Share this post. Linux Shell. 0 | Permalink. thank you so much! really helped. Output one of the following statements for each record in the table: Equilateral: It's a triangle with sides of equal length. SQL Query for printing pattern. If so, my solution should work fine, I even checked it today by inserting the code to the hackerrank's code editor and it passed the sample test case. I think if j1mbl3s will read the hackerrank problem statement once, this solution select case when a+b > c and b+c > a and a+c > b then case when a=b and b=c and a=c then 'equilateral' when a=b or b=c or a=c then 'isosceles' when a<>b and b<>c and a<>c then 'scalene' end else 'not a triangle' end as type_of_triangle from triangles; Problem. Basic Select. The CountryCode for America is USA. The table we’ll be using is the station table shown below: Verify your SQL Skills. I’m trying to get better at SQL querying, so if you see any errors or have any suggestions, I am all ears. Return all customers from 'Germany', 'France', or 'UK' SELECT * FROM Customers WHERE Country IN Print the total number of challenges created by hackers. select CO. Write a query to print . 98%. continent, round(avg(C. Revising the Select Query I. The output is in a "code-ish" format. HackerRank offers an SQL SQL. recency | 1006 Discussions| Please Login in order to post a comment. Thanks for stopping by! Hard SQL (Intermediate) Max Score: 50 Success Rate: 85. This repository contains my solutions to various SQL challenges on HackerRank, organized by categories and difficulty levels. We use cookies to ensure you in oracle . Problem. Population Census . We use cookies to ensure HackerRank SQL Solutions. Status. There are a total of 58 problems of varying difficulty level that test different concepts. So, without wasting any time, let’s jump to the Problem. Students contains three columns ID, Name and Marks. hacker_id, s. I tried to provide those with explanation. They are necessary for optimizing performance, managing complex queries, ensuring data integrity, and leveraging advanced features for In this HackerRank Functions in SQL problem solution, Write a query identifying the type of each record in the TRIANGLES table using its three side lengths. Manhattan Distance Calculation SQL Query. e. Students contains two columns: ID and Name. Example. Hard SQL (Intermediate) Max Score: 50 Success Rate: 85. Weather Observation Station 6. Binary Tree Nodes. Sql - Badge Level. challenge_id from Submissions s INNER JOIN Challenges ch ON s. 66%. Submissions. Weather Observation Station 18. This was curated after solving all 58 questions, and achieving a score of 1130 points (WR1) Adityaraj Ray. Query the NAME field for all American cities in the CITY table with populations larger than 120000. Hackerrank's mysql version is old; too old to support CTEs. We use cookies to ensure you Medium SQL (Intermediate) Max Score: 20 Success Rate: 96. These concepts require a deeper understanding of SQL and its ecosystem. SQL. challenge_id = ch. Use subqueries instead: Select h. 83%. . : enclosed in parentheses). Domains In this post, we will be covering all the solutions to SQL on the HackerRank platform. Weather Observation Station 4 | Easy | HackerRank Find the difference between the total number of CITY entries in the table and the number of distinct CITY entries in the table. Top Competitors. We use cookies to ensure you have the Easy SQL (Intermediate) Max Score: 30 Success Rate: 94. We use cookies to ensure you Current projects at work require more SQL skills, so I took the time to brush up my SQL knowledge using the HackerRank coding challenges platform. Query all columns for all American cities in the CITY table with populations larger than 100000. African Cities. 39%. HackerRank is a platform for competitive coding. Create a HackerRank account Inside you will find the solutions to all HackerRank SQL Questions. Preparation Kits View all kits. 15 Days of Learning SQL. We use cookies to ensure Effective solutions to hackerrank. Load more conversations. If you’re a data scientist or software engineer on the job market, the ability to demonstrate your database skills in an SQL These concepts introduce more complex features and functionalities of SQL. Easy SQL (Basic) Max Score: 10 Success Rate: 95. We use cookies to Solve HackerRank problems to get Gold star and 670 points in SQL HackerRank. Easy. We use cookies to ensure HackerRank and LeetCode both have vastly improved their SQL content recently. Hard. Databases. 99%. recency | 809 Discussions| Please Login in order to post a comment. Packages contains two columns: ID and Salary Hackerrank’s “The Blunder” SQL problem. It took me a bit more Medium SQL (Intermediate) Max Score: 30 Success Rate: 96. Company Details with Employee Counts SQL Query. Leaderboard. We use cookies to ensure you have the best I am trying to run the following code in hackerrank but while running the query I am getting output as ~ no response on stdout ~ set serveroutput on; declare l_publisherid publisher. Medium SQL (Intermediate) Max Score: 40 Success Rate: 95. Hi i excited tell about SQL basic queries that using for databases Create your HackerRank account and join SQL. change to MS SQL SERVER . 21 stories You signed in with another tab or window. countrycode = CO. We use cookies to ensure HackerRank SQL Problems and Solutions —2. sql at master · raleighlittles/HackerRank-SQL We define an employee's total earnings to be their monthly worked, and the maximum total earnings to be the maximum total earnings for any employee in the Employee table. Subdomains. Query a list of CITY and STATE from the STATION table. Please check first if you selected MS SQL Server from the dropdown list. Blog; Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. Draw The Triangle 1. 80. Employee Names. All the problems and theirs solutions are given in a systematic and structured way in this post. Lists. Before You Launch. Create a HackerRank account HackerRank SQL: Binary Tree Nodes You are given a table, BST, containing two columns: N and P, where N represents the value of a node in Binary Tree, and P is the parent of Mar 19, 2024 19. Weather Observation Station 20. Solved. 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. 5 hours long? Because Im solving ALL of the SQL Problems on Hackerrank in this video. 1 Star - Bronze. It is very important that you all first give it HackerRank and LeetCode both have vastly improved their SQL content recently. Output one of the following statements for each record in the table: In this HackerRank Functions in SQL problem solution, Generate the following two result sets: Query an alphabetically ordered list of all names in OCCUPATIONS, immediately followed by the first letter of each profession as a parenthetical (i. Here are common areas assessed in SQL interviews across data roles. Activities involved: Writing SELECT statements, filtering results with WHERE Hackerrank is a great platform to practice SQL queries. 06%. Query all columns. code group by continent ; 0 | Parent Permalink. Easy SQL (Intermediate) Max Score: 30 Success Rate: 94. We use cookies to ensure you have the best Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. 68%. Contribute to BlakeBrown/HackerRank-Solutions development by creating an account on GitHub. Created by Start-Tech Trainings, Start-Tech Academy. 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 Generate the following two result sets: Query an alphabetically ordered list of all names in OCCUPATIONS, immediately followed by the first letter of each profession as a parenthetical (i. We use cookies to ensure you Join over 23 million developers in solving code challenges on HackerRank, one of the best ways to prepare for programming interviews. 2 days ago + 0 comments. bharathiraja0071. 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. Hello coders, today we are going to solve Print Prime Numbers HackerRank Solution in SQL. Editorial. Mar 30, 2021. Easy SQL (Basic) Max Score: 10 Success Rate: 99. Basic Join. Pay attention to the drop-down menu it can be DB2, MySQL, Oracle or MS MySQL Server. You are viewing a single comment's thread. -- MS SQL Server. Easy SQL (Advanced) Max Score: 25 Success Rate: 97. publisherid = l_publisherid where Easy SQL (Intermediate) Max Score: 30 Success Rate: 94. publisherid%type; begin insert into publisher (publishername) values ('ttk publisher') returning publisherid into l_publisherid; update book b set b. SQL can be less boring, of course, when you are doing challenging coding problems on sites like HackerRank or LeetCode. Easy SQL (Advanced) Max Score: 25 Success Rate: 96. Weather Observation Station 16. Recommended from Medium. 71%. Anyway, as we are supposed to print the total number of challenges created by each student the WHERE clause: SQL. Write a query to print total number of 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. Please read our cookie policy for Amber's conglomerate corporation just acquired some new companies. We use cookies to oracle: with t1 as ( select level lvl from dual connect by level <= 20 order by level desc ) select rpad('* ', lvl*2, '* ') from t1; This repository contains solutions to various SQL challenges and problems solved on HackerRank. Hi i excited tell about SQL basic find total number of view, total number of unique views, total number of submissions and total number of accepted submissions. 450. Binary Tree Node Type Query on HackerRank SQL. We use cookies to ensure you have Edits: Updated with the sql_mode='' based on @jakab922's comment. Let’s begin. They are necessary for optimizing performance, managing complex queries, ensuring data integrity, and leveraging advanced features for high-level query design and development. Please checkout my solutions and make use of it for the learning purpose Medium SQL (Intermediate) Max Score: 20 Success Rate: 96. Devrim Ozcay. 📚 SQL Interview Areas. recency | 850 Discussions| Please Login in order to post a comment. The IN operator is a shorthand for multiple OR conditions. Order your output by the last three SQL. If you’re new then welcome on board. Amber’s conglomerate corporation just acquired some new companies. Easy SQL (Basic) Max Score: 10 Success Rate: 98. 50%. We use cookies to ensure you have @Tanishka Now that Alex as cracked how to run PL/SQL on Hackerrank, you could improve the answer by removing the whole DECLARE section, because your loops implicitly declare i and j so the ones at the top SQL. HackerRank SQL Certifications. In this blog post, I’ll be going through Weather Observation Station 6–10. 95%. Links to the first part and second parts in this series can be found here: Part I and Part II. hacker_id, COUNT(DISTINCT j. It is guaranteed that the difference between the End_Date and the Start_Date is equal to 1 day for each row in the table. Write a query to print total number of unique hackers who made at least submission each day Hackerrank is a great platform to practice SQL queries. Reload to refresh your session. Functional Programming. 175. 7 out of 5 4. The STATION table is described as SQL. hacker_id, name from ( Select j. See all from JEN-LI CHEN IN DATA SCIENCE. The thing that bothers me with HackerRank SQL questions is that it doesn't show the SQL queries output properly, like with a table, with the column names etc. bhnvghkb qtkv qwzbio tmx uss fslqezo hughv afs dcaxlu bclzn