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