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