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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Lenguaje de programación: SQL
SQL frameworks and libraries: MySQL, PostgreSQL, Oracle, MSSQL and others
evaluar los conocimientos de Matemáticas, Probabilidad, Habilidades sociales, SQL
evaluar los conocimientos de 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.
evaluar los conocimientos de JavaScript, Node.JS
evaluar los conocimientos de JavaScript, Node.JS, SQL
Node.JS | API Rest | Servicio backend de noticias - Implementar un servicio backend de noticias creado en Node.JS con Vanilla JS incluyendo autorización de escritura y APIs Rest.
evaluar los conocimientos de Pensamiento lógico, Matemáticas, MySQL, SQL
evaluar los conocimientos de SQL
SQL | MySQL | Stamps catalogue | AVG Function - Select the stamps (name and price) with price greater than or equal to the total average price.
evaluar los conocimientos de Pensamiento lógico, SQL, MySQL
evaluar los conocimientos de MySQL, SQL
SQL | MySQL | Stamps catalogue | A Self JOIN - Select stamps (name and location) that are in the same location.
evaluar los conocimientos de SQL, PostgreSQL
evaluar los conocimientos de PostgreSQL, SQL
SQL | PostgreSQL | Music Store | Función Tiempo - Calcula la duración de todas las canciones de cada cd y muestra una lista.
evaluar los conocimientos de Pensamiento lógico, SQL
evaluar los conocimientos de SQL
SQL | PostgreSQL | Hotels - average prices - Prepare the report with the average prices in the cities.
evaluar los conocimientos de Pensamiento lógico, SQL
evaluar los conocimientos de SQL
SQL | PostgreSQL | Hotels - bookings - Prepare the booking list with a number of days, price per day and total price of the stay.
evaluar los conocimientos de Pensamiento lógico, 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.
evaluar los conocimientos de DevOps, Terraform, AWS
evaluar los conocimientos de 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.
evaluar los conocimientos de Java, Spring Boot
evaluar los conocimientos de PostgreSQL, SQL
Java | Spring Boot | Microservicio Recuperador de Artículos - Implementar un microservicio para recuperar artículos del sistema de compras.
SQL | MSSQL | Encontrar nulos - Escribir una consulta que devuelva los nombres de todos los elementos que no están disponibles
SQL | MSSQL | Búsqueda de intervalos de fechas - Escriba una consulta que devuelva los nombres de todos los elementos añadidos en los últimos 7 días.
SQL | MSSQL | Uso de agregados - Escriba una consulta que devuelva los nombres de todos los elementos de una categoría determinada
SQL | MSSQL | Encontrar duplicados - Escribir una consulta que devuelva los nombres de todos los elementos que están duplicados
evaluar los conocimientos de Grandes datos, PySpark, Python
evaluar los conocimientos de SQL
Python | PySpark | Corporación de gestión de flotas - Detectar eventos de exceso de velocidad y verificar la corrección de un predictor existente.
JavaScript | TypeScript | Aplicación de facturas - frontend - Implementar la parte front-end para fusionar y agregar los datos de la factura con los tipos de cambio de divisas.
Java | Aplicación de facturas - backend - Implementar la parte backend para buscar y agregar datos de facturas con el servicio y los métodos DAO.
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.
evaluar los conocimientos de Python
Python | Informe de ventas de vehículos - Implemente una aplicación para crear informes basados en el almacén de datos de ventas de vehículos.
evaluar los conocimientos de DevOps, Docker
DevOps | Master of Disaster Recovery (CentOS) - Recover data from broken MariaDB/MySQL database.
evaluar los conocimientos de DevOps, Docker
DevOps | Master of Disaster Recovery (Ubuntu) - Recover data from broken MariaDB/MySQL database.
evaluar los conocimientos de SQL
evaluar los conocimientos de SQL
SQL | PostgreSQL | Hotels - hotels page optimization - Improve the performance of the the hotels listing page which currently uses ORM.
evaluar los conocimientos de SQL, MongoDB, NoSQL
evaluar los conocimientos de 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.
evaluar los conocimientos de SQL
evaluar los conocimientos de ES6, JavaScript, CSS, HTML, WCAG 2.0, Accesibilidad web
PHP | Repositorio de Categorías - Implementar consultas PDO que devolverán resultados válidos sobre películas a los usuarios.
evaluar los conocimientos de SQL, ES6, JavaScript, AJAX, Desarrollo web
PHP | XML-CSV Converter - Implementar métodos de filtrado y transformación de datos para pasar todas las pruebas.
evaluar los conocimientos de SQL, CSS, HTML
evaluar los conocimientos de JavaScript
PHP | Faker | Manipulación básica de datos - Implementa todos los métodos de la clase app/Faker.
evaluar los conocimientos de SQL, MongoDB, NoSQL
evaluar los conocimientos de 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.
evaluar los conocimientos de SQL, MongoDB, NoSQL
evaluar los conocimientos de 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 Salud
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.
