Sql in hackerrank. The STATION table is described as … SQL.

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