Sql in hackerrank. 4 weeks ago + 0 comments.

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