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SQL Online Test

The SQL online test evaluates a candidate's ability to design and build relational databases and tables from scratch, apply CRUD options, write efficient queries and subqueries to filter data and create efficient indexes for faster SQL queries.

Covered skills:

  • Creating databases
  • Creating and deleting tables
  • CRUD operations on tables
  • Joins & Subqueries
  • Conditional expressions and procedures
  • Views
  • Indexes
  • String functions
  • Mathematical functions & Timestamps
  • Locks and Transactions
  • Scale and Security
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About the SQL Test


The SQL Online Test helps recruiters and hiring managers identify candidates who possess a strong understanding of SQL and its applications. This test aids in making data-driven hiring decisions and streamlines the screening process by filtering candidates based on their practical SQL knowledge, reducing the time spent on interviewing unqualified applicants.

This test assesses a candidate's abilities in various SQL skills, including database creation and table management, CRUD operations, joins and subqueries, conditional logic and stored procedures, view creation, index optimization, string and mathematical function utilization, timestamp manipulation, lock and transaction management, and considerations for scale and security. It's designed to provide a clear picture of a candidate's preparedness to work with SQL in real-world scenarios.

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Non-googleable questions


We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

These are just a small sample from our library of 15,000+ questions. The actual questions on this SQL Online Test will be non-googleable.

🧐 Question

Medium

Multi Select
JOIN
GROUP BY
Sql Join
Data Analysis
Solve
Consider the following SQL table:
 image
How many rows does the following SQL query return?
 image

Medium

nth highest sales
Nested queries
User Defined Functions
Solve
Consider the following SQL table:
 image
Which of the following SQL commands will find the ‘nth highest Sales’ if it exists (returns null otherwise)?
 image

Medium

Select & IN
Nested queries
Solve
Consider the following SQL table:
 image
Which of the following SQL queries would return the year when neither a football or cricket winner was chosen?
 image

Medium

Sorting Ubers
Nested queries
Join
Comparison operators
Solve
Consider the following SQL table:
 image
What will be the first two tuples resulting from the following SQL command?
 image

Hard

With, AVG & SUM
MAX() MIN()
Aggregate functions
Solve
Consider the following SQL table:
 image
How many tuples does the following query return?
 image
🧐 Question 🔧 Skill

Medium

Multi Select
JOIN
GROUP BY
Sql Join
Data Analysis

2 mins

SQL
Solve

Medium

nth highest sales
Nested queries
User Defined Functions

3 mins

SQL
Solve

Medium

Select & IN
Nested queries

3 mins

SQL
Solve

Medium

Sorting Ubers
Nested queries
Join
Comparison operators

3 mins

SQL
Solve

Hard

With, AVG & SUM
MAX() MIN()
Aggregate functions

2 mins

SQL
Solve
🧐 Question 🔧 Skill 💪 Difficulty ⌛ Time
Multi Select
JOIN
GROUP BY
Sql Join
Data Analysis
SQL
Medium 2 mins
Solve
nth highest sales
Nested queries
User Defined Functions
SQL
Medium 3 mins
Solve
Select & IN
Nested queries
SQL
Medium 3 mins
Solve
Sorting Ubers
Nested queries
Join
Comparison operators
SQL
Medium 3 mins
Solve
With, AVG & SUM
MAX() MIN()
Aggregate functions
SQL
Hard 2 mins
Solve
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Preview questions
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Why you should use Pre-employment SQL Online Test?

The SQL Online Test offers a practical method to gauge a candidate's real-world SQL abilities. It bypasses purely theoretical knowledge and focuses on skills applicable to everyday database interactions, ensuring that candidates who perform well demonstrate job-ready capabilities.

This assessment evaluates a candidate's aptitude in key areas. It probes their capability to design and manipulate database structures, including creating, altering, and deleting tables. It also measures their command of CRUD (Create, Read, Update, Delete) operations, proficiency in combining data from multiple sources using joins and subqueries, and their skill in applying conditional logic and stored procedures. Furthermore, it assesses their ability to leverage views for data abstraction, utilize indexes for query optimization, and apply string and mathematical functions for data transformation. The test also looks at the knowledge around timestamps.

Upon completion of the test by a candidate, you'll receive a detailed scorecard. This report includes a skills breakdown, providing insight into the candidate's strengths and weaknesses. This detailed analysis, coupled with benchmark data, allows you to streamline your hiring process and identify the most promising candidates from your applicant pool.

What topics are covered in the SQL Online Test?

This test gauges a candidate's skills in SQL, covering a spectrum of database operations and concepts. It aims to provide insights into their ability to work with relational databases, a cornerstone of modern data management.

The assessment starts by examining their competence in Creating databases and Creating and deleting tables. This tests the candidate's understanding of database structure and design principles. The ability to build and manage database schemas is a primary requirement for any database professional.

Next, the test assesses CRUD operations on tables, which encompass the core actions of Create, Read, Update, and Delete. Mastering these operations is about skillfully manipulating data within a database, a task performed daily by database developers and administrators.

Furthermore, the test dives into Joins & Subqueries. These skills are tested to see if candidates can combine data from multiple tables and create complex queries for data retrieval. Proficiency in joins and subqueries enables candidates to solve intricate data-related problems.

We then evaluate the candidate's knowledge of Conditional expressions and procedures. Conditional expressions allow for dynamic query execution based on specific criteria, and procedures facilitate the creation of reusable code blocks. These skills enable the streamlining and automation of database tasks.

The assessment further covers Views, which are virtual tables based on the result-set of an SQL statement. A solid knowledge of views is important to provide simplified access to underlying data, improving security, and data abstraction. Indexes which are looked into next help to speed up data retrieval by creating pointers to data within a database table.

Candidates are also evaluated on their ability to use String functions, Mathematical functions & Timestamps. String functions allow for the manipulation and analysis of text data, mathematical functions for calculations within queries, and timestamp functionalities for managing date and time information. This broadens the scope of data manipulation possibilities.

The test probes into Locks and Transactions. These are critical for managing concurrency and ensuring data integrity in multi-user environments. Expertise in these concepts is helpful in building reliable and scalable database applications.

Finally, the assessment addresses Scale and Security. These topics address the candidate's awareness of how to optimize database performance for large datasets and how to protect data from unauthorized access. These insights help with the design of secure and scalable database systems.

Full list of covered topics

The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for SQL Online Test to be based on.

Creating databases
Managing databases
Creating tables
Deleting tables
Data types
Table constraints
Inserting data
Updating data
Deleting data
Joins
Subqueries
Conditional expressions
Procedures
Views
Data abstraction
Indexes
Query performance
String functions
Mathematical functions
Timestamps
Locks
Transactions
Scaling databases
Securing databases
Data storage
Data manipulation
Data analysis
Data calculations
Data consistency
Efficiency
Safety

What roles can I use the SQL Online Test for?

  • Database Administrator
  • SQL Developer
  • Data Analyst
  • Business Intelligence Developer
  • Software Engineer
  • Data Engineer
  • Data Scientist
  • Data Architect
  • System Analyst
  • Senior SQL Developer
  • Business Analyst (SQL)

How is the SQL Online Test customized for senior candidates?

For senior-level SQL candidates, the assessment is designed to explore their expertise in more advanced database concepts and their ability to handle complex scenarios. Questions will be oriented around real-world problems.

The assessment for senior SQL roles covers areas like optimization strategies, transaction management and concurrency control, and security implementation. The questions also explore the candidate’s ability to design scalable database architectures, implement advanced indexing techniques for performance tuning, and handle complex data transformations using window functions and other advanced SQL features. Furthermore, it evaluates their understanding of data security principles and their ability to implement appropriate security measures, and their understanding of locks and transactions in SQL, and how they impact concurrency and data integrity.

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Non-googleable Questions

Web Proctoring

IP Proctoring

Webcam Proctoring

MCQ Questions

Coding Questions

Typing Questions

Personality Questions

Custom Questions

Ready-to-use Tests

Custom Tests

Custom Branding

Bulk Invites

Public Links

ATS Integrations

Multiple Question Sets

Custom API integrations

Role-based Access

Priority Support

GDPR Compliance

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Have questions about the SQL Hiring Test?

What is SQL Online Test?

The SQL Online Test evaluates a candidate's proficiency in SQL. Businesses use it to assess skills in databases, tables, CRUD operations, and more. It is helpful for screening database professionals.

Can I combine SQL Online Test with PHP questions?

Yes, recruiters can request a custom test with multiple skills. For assessing PHP skills, consider our PHP Online Test.

What topics are evaluated in the SQL Online Test?

This test covers:

  • Creating and deleting tables
  • Joins and Subqueries
  • Views and Indexes
  • Locks and Transactions
  • Scale and Security
  • Mathematical and String Functions
How to use SQL Online Test in my hiring process?

Use the SQL Online Test as a pre-screening tool early in recruitment. Add a link to the test in your job post or invite candidates by email. This approach helps in identifying skilled candidates faster.

What are the main Database tests?

Beyond the SQL Online Test, explore more database-related assessments:

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

  • Hidden AI Tools Detection with Honestly
  • Non-googleable questions
  • IP proctoring
  • Screen proctoring
  • Web proctoring
  • Webcam proctoring
  • Plagiarism detection
  • Secure browser
  • Copy paste protection

Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

View sample scorecard


Along with scorecards that report the performance of the candidate in detail, you also receive a comparative analysis against the company average and industry standards.

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