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