DevSkiller specializes in creating SQL developer interview questions aimed at recruiting only the best SQL engineers. Our tests are uniquely structured to assess the skills of candidates of any level.
You may have heard of RealLifeTesting™. A unique testing methodology used to replicate real-world scenarios and present candidates with realistic challenges, similar to those they face every day. It is implemented into all of our developer tests to ensure our clients hire only the best developers. Find your next SQL developer with our range of SQL developer interview questions.
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PostgreSQL online coding tests & interview questions
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Programming language: SQL
SQL frameworks and libraries: MySQL, PostgreSQL, Oracle, MSSQL and others
에 대한 지식 평가 Math, Probability, Soft Skills, SQL
에 대한 지식 평가 MySQL, SQL
SQL | MySQL | Software House | Devs and their projects - The Head of the development team assigned you a task to create a list of developers with their role in the ongoing projects.
에 대한 지식 평가 자바스크립트, Node.JS
에 대한 지식 평가 자바스크립트, Node.JS, SQL
Node.JS | Rest API | News backend service - Implement a news backend service created in Node.JS with Vanilla JS including writing authorization and Rest APIs.
에 대한 지식 평가 Logical thinking, Math, MySQL, SQL
에 대한 지식 평가 SQL
SQL | MySQL | Stamps catalogue | AVG Function - Select the stamps (name and price) with price greater than or equal to the total average price.
에 대한 지식 평가 Logical thinking, SQL, MySQL
에 대한 지식 평가 MySQL, SQL
SQL | MySQL | Stamps catalogue | A Self JOIN - Select stamps (name and location) that are in the same location.
에 대한 지식 평가 SQL, PostgreSQL
에 대한 지식 평가 PostgreSQL, SQL
SQL | PostgreSQL | Music Store | Time function - Calculate the duration of all songs in each cd and output a list.
에 대한 지식 평가 Logical thinking, SQL
에 대한 지식 평가 SQL
SQL | PostgreSQL | Hotels - average prices - Prepare the report with the average prices in the cities.
에 대한 지식 평가 Logical thinking, SQL
에 대한 지식 평가 SQL
SQL | PostgreSQL | Hotels - bookings - Prepare the booking list with a number of days, price per day and total price of the stay.
에 대한 지식 평가 Logical thinking, SQL
SQL | PostgreSQL | Hotels - cities and top hotels - Prepare a list of cities with the date of last reservation and a main photo (photos[0]) of the most popular (by number of bookings) hotel in this city.
에 대한 지식 평가 DevOps, Terraform, AWS
에 대한 지식 평가 DevOps, Terraform, AWS
DevOps | Terraform, AWS | Create the EC2 instance using specific AMI - Create the EC2 instance using specific AMI in a default VPC with SSH access, using Terraform and AWS provider.
에 대한 지식 평가 Java, Spring Boot
에 대한 지식 평가 PostgreSQL, SQL
Java | Spring Boot | Items Retriever Microservice - Implement a microservice to retrieve items from the shopping system.
SQL | MSSQL | Finding nulls - Write a query that returns the names of all items which are not available
SQL | MSSQL | Finding date ranges - Write a query that returns the names of all items added within the last 7 days.
SQL | MSSQL | Using aggregates - Write a query that returns the names of all items of a given category
SQL | MSSQL | Finding duplicates - Write a query that returns the names of all items which are duplicated
에 대한 지식 평가 Big Data, PySpark, Python
에 대한 지식 평가 SQL
Python | PySpark | Fleet management corporation - Detect speeding events and verify correctness of an existing predictor.
JavaScript | TypeScript | Invoice application - frontend - Implement the front-end part for merging and aggregating the invoice data with currency exchange rates.
Java | Invoice application - backend - Implement the backend part for searching and aggregating invoice data with the service and the DAO methods.
SQL | Stamps catalogue | The three highest prices - Select three stamps (price and name) with the highest price.
Python | Pandas | HTML table parser - Implement a function to convert HTML table into a CSV-format file.
에 대한 지식 평가 Python
Python | Vehicle sales report - Implement an application to create reports based on the vehicle sales data warehouse.
에 대한 지식 평가 DevOps, Docker
DevOps | Master of Disaster Recovery (CentOS) - Recover data from broken MariaDB/MySQL database.
에 대한 지식 평가 DevOps, Docker
DevOps | Master of Disaster Recovery (Ubuntu) - Recover data from broken MariaDB/MySQL database.
에 대한 지식 평가 SQL
에 대한 지식 평가 SQL
SQL | PostgreSQL | Hotels - hotels page optimization - Improve the performance of the the hotels listing page which currently uses ORM.
에 대한 지식 평가 SQL, MongoDB, NoSQL
에 대한 지식 평가 MongoDB
SQL | Customer Data - Find all the customers whose first and last names are not unique in this database, as well as the number of times each first and last name pair appears in the database.
에 대한 지식 평가 SQL
에 대한 지식 평가 ES6, 자바스크립트, CSS, HTML, WCAG 2.0, Web Accessibility
PHP | Categories Repository - Implement PDO queries that will return valid results about movies to users.
에 대한 지식 평가 SQL, ES6, 자바스크립트, AJAX, 웹 개발
PHP | XML-CSV Converter - Implement filtering and data transformation methods to pass all the tests.
에 대한 지식 평가 SQL, CSS, HTML
에 대한 지식 평가 자바스크립트
PHP | Faker | Basic data manipulation - Implement all the methods in the app/Faker class.
에 대한 지식 평가 SQL, MongoDB, NoSQL
에 대한 지식 평가 MongoDB
SQL | Fill sparse table - Write a query that will return the list of all users with the creation date and return the date from the previous not-null row for the entries affected with the bug.
에 대한 지식 평가 SQL, MongoDB, NoSQL
에 대한 지식 평가 MongoDB, SQL
SQL | Stamps catalogue | CASE statement - Make a select statement, by which you will divide your stamps collection into 3 groups.
The driving force behind DevSkiller’s SQL developer interview questions and tests is the RealLifeTesting™ methodology. It allows DevSkiller to create a simulated version of reality in order to test developer candidates with realistic challenges similar to the work they do every day. With our SQL developer interview questions and tests you can analyze your applicants’ knowledge of SQL, assess their coding ability, test their problem-solving, and time-management skills.
SQL is a 4th Generation Programming Language (4GL). Basically, this means that programmers only declare what the result looks like, rather than how the database should calculate the result. SQL uses more general-purpose programming languages like Java to access data from central databases.
The right SQL candidate should possess a good knowledge of SQL, including the subtleties and the nuances of its performance. They should possess skills in SQL design and relational theory. Finally, any demonstrable skills in SQL refactoring will come in handy in larger teams where the SQL is more complex.
Perhaps your business needs require you to get more out of our SQL online tests. If so, then you can customize our SQL developer interview questions and tests to fit your recruitment agenda. You can set the difficulty level, length, and even question duration on each individual test. You can monitor applicants in real-time and our plagiarism detectors ensure test validity. Find your next SQL engineer with DevSkiller’s SQL developer interview questions and online tests.
If you think our screening tool sounds great, but you’re a little unsure. No problem. Some of our past clients felt the same way as you, to begin with. Read the following case study to learn how we helped them:
Ada Health
Ada is a global health company. Their core system connects medical knowledge with intelligent technology to help people manage their health and for medical professionals to deliver effective care.
The company requires skill in technologies such as Kotlin, Java, React Native, and many more. Previously Ada screened technological skills through an on-site task, followed by a team interview. The whole procedure was laborious and time-consuming so they enlisted DevSkiller’s help.
Thanks to DevSkiller, Ada ar now able to gain a broader understanding of each candidate’s experience from an initial technical task, which is carried out prior to interviews taking place. Evaluation for DevSkiller testing is automated, which saves countless hours of time for Ada’s recruitment employees.
“Not only do we save a considerable amount of time, but the tool also gives us the possibility to collaborate on reviewing the technical test. It also enables us to tailor the on-site experience towards the candidate, for example, which areas to focus on or how difficult the questions should be. Overall, the feedback has been quite positive. Candidates especially enjoy the Code Review task.”
Don’t worry, you’re not expected to be a technical expert yourself to be able to use DevSkiller. Our own experts have created ready-to-use SQL developer interview questions and tests which are specially designed to be easy for recruiters to get the best out of. This means you can verify the technical skills of the candidates screened regardless of your own level of technological skill. You can prepare a test from scratch if required.
You need to be able to trust your results, so at DevSkiller we take plagiarism very seriously. We employ a number of anti-plagiarism tools designed to catch any cheats in the act. We can implement screen recording to check if the candidate is looking at a different screen when undertaking a test, as well as a range of social listening tools. We can also check the candidate’s entered code, question duration, and the way each question was answered. Our database stores answers previously provided, which are cross-checked against new answers coming in. If there is a match it will flag that the candidate has tried to gain an unfair advantage.
We have received regular feedback from developer candidates that they love the structure of our SQL developer interview questions. It is important to understand that more often than not, developer testing involves candidates having to recite coding patterns and algorithms. This can frustrate developers because this doesn’t assess their actual development skills and could result in a lesser skilled developer progressing, simply because they happen to remember a coding pattern. We don’t leave anything to chance. Our SQL developer interview questions and tests challenge candidates with tasks exactly like the work they’ll be doing.
In turn we hear that candidates relish having the chance to use normal coding tools and conventions like unit testing, and cloning to GIT from a personal IDE. We give developer candidates a chance to demonstrate what they can really do within a fair setting and for that they are thankful.
The duration of our SQL developer interview questions and tests is flexible. Duration can be set to your own preferences if required. We provide default settings which can be altered. It is also possible to set time limits for individual questions within a test.
