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SQL Online Test

The SQL 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.

Customized Based On:

  • Experience/ difficulty level
  • Multiple skills in 1 assessment
  • Job description/ role requirements

Covered Topics:

Creating databases
Creating and deleting tables
CRUD operations on tables
Joins & Subqueries
Conditional expressions and procedures
String functions
Mathematical functions & Timestamps
Locks and Transactions
Scale and Security
See full list
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The hiring managers felt that through the technical questions that they asked during the panel interviews, they were able to tell which candidates had better scores, and differentiated with those who did not score as well. They are highly satisfied with the quality of candidates shortlisted with the Adaface screening.

Human Resources Manager

Singapore Government

reduction in screening time

Sample SQL Online Test Questions

These are just a small sample from our library of 10,000+ questions. The actual questions on this SQL Online Test will be non-googleable.

🧐 Question🔧 Skill💪 Difficulty⌛ Time
Multi Select
Consider the following SQL table:
How many rows does the following SQL query return?
SQLMedium2 min
Select & IN
Consider the following SQL table:
Which of the following SQL queries would return the year when neither a football or cricket winner was chosen?
SQLEasy3 min
With, AVG & SUM
Consider the following SQL table:
How many tuples does the following query return?
SQLMedium2 min

How to use the Adaface SQL Online Test

Start screening candidates within minutes with the ready-to-go SQL Online Test

1. Choose the most appropriate test for your role

2. Start inviting candidates to complete the assessment

3. Receive real time notifications and shortlist the best candidates

Customize the Adaface SQL Online Test according to your job description

1. Get a custom assessment from our library of 500+ skills within 48 hours

2. Start inviting candidates to complete the assesment

3. Receive real time notifications and shortlist the best candidates

Adaface SQL Online Test is trusted by enterprises worldwide

Morgan Stanley
SG Government
Ernst and Young
Optimum Solutions
United Nations
Love Bonito

About the Adaface SQL Assessment Test

Evaluate SQL technical and coding skills with Adaface skills assessment platform powered by an intelligent chatbot


The Relational Model
SQL Basics
SQL Functions
Data Modification Language
Data Query Language
SQL Filtering / WHERE Statement
3 Valued Logic
Window Functions
Date Filtering and Timestamps
Aggregate Functions
Operator Precedence
Top-Down Design
Bottom-Up Design
Entity Relationship Diagram
Database Types
Multi-Table SELECT
Permission Management
Backup Strategies
Data Types
Vertical + Horizontal Scaling
Distributed vs Centralized Databases
Database Security
SQL Injections
Access Control

Recommended Roles:

SQL Developer
Data Analyst
Data Scientist
DevOps Engineer
SQL Database Administrator
Software Engineer - SQL
Senior SQL Developer
Senior Database Developer
Business Analyst (SQL)

Why You Should Use This SQL Online Assessment Test

The SQL online assessment test helps recruiters and hiring managers identify qualified SQL experts from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves expensive engineering time by filtering out unqualified candidates. The Adaface SQL Online Test screens candidates for the typical skills recruiters look for in an SQL developer:

  • Create a relational database from scratch
  • Create, alter and delete tables from a database
  • Insert, update and delete data from a table
  • Retrieve data from a database using select queries
  • Filter data using where clauses and logical operators
  • Order and limit data retrieved from a table
  • Use aggregate functions and group data to gain more meaningful insights from a database
  • Relate tables together using database relationships
  • Use SQL join queries to retrieve data from multiple tables in a single query
  • Master complex SQL subqueries
  • Apply SQL string functions

How do you customize this test for Senior SQL developers?

The topics of questions vary based on the seniority level/ experience of the candidates for your role. Here are a few advanced SQL topics questions will be based on:

  • Writing and analyzing advanced SQL queries and subqueries
  • Creating and using views
  • Creating and using sequences
  • Windowing functions for working with ordered data sets
  • Creating and using efficient indexes
  • Creating and using synonyms
  • Data dictionary views
  • Generating (Dynamic) SQL Scripts
  • Advanced Aggregation Techniques
  • Administering User Privileges and Roles
  • Using Regular Expressions
  • Database triggers
  • Local & Global variables
  • Stored routines
  • Scaling database (Sharding, Replication, Backups)
  • Vertical + Horizontal Scaling
  • Connecting a SQL database to a server
  • Data Modeling (ER diagram & Normalization)
  • ETL fundamentals

The exact topics will be picked based on your job description.

About SQL Developer Job Roles

SQL (Structured Query Language) is a standard database language that is used to create, maintain and retrieve relational databases. SQL itself is not a programming language, but its standard allows creating procedural extensions for it, which extend it to the functionality of a mature programming language.

SQL Developers are responsible for developing SQL databases and writing applications to interface with SQL databases. Development often consists of designing tables, storing procedures, views and functions.

Typical SQL Developer responsibilities may include:

  • Development of high-quality database solutions
  • Review and interpret ongoing business report requirements
  • Analyze existing SQL queries for performance improvements
  • Server maintenance, which can also involve troubleshooting database programs and operations
  • Develop procedures and scripts for data migration
  • Handle common database procedures such as upgrade, backup, recovery, migration, etc.

Distribution Of Test Scores

The actual score distribution will vary based on your candidate pipeline quality, but you should typically expect ~20% of the candidates to do well on Adaface assessments.

The score distribution for our assessments follow the normal curve. This is a good sign- standardized tests like SAT and GRE follow the normal distribution (bell curve).

Status quo assessments typically have the exact opposite of the bell curve (too many candidates getting close to 0, too many candidates getting close to 100 and too few candidates in the middle). This is typically because they focus on theoretical questions or trick questions, which are very binary in nature- either you know the trick/ theory or you don’t.

How Adaface Is Different

Adaface conversational assessments are reflective of on-the-job skills and see an 86% completion rate as compared to ~50% for traditional assessment platforms.



Theoretical questions/ puzzles

Feels like a test

One-size-fits-all assessments




Questions for on-the-job skills




SQL Online Test FAQs

Can I evaluate relational database management systems like MySQL, PostgreSQL, MS SQL instead of SQL?

Yes. We provide focused tests that can help you assess database management systems instead of query language SQL. You can review our standalone MySQL test, PostgreSQL test and MS SQL test for in-depth details on what kind of questions are used to evaluate those skills.

Can I evaluate SQL and coding skills in the same test?

Yes. We support testing multiple skills in the same test. You can get a customized test where MCQ questions are used to evaluate SQL knowledge and coding questions are used to evaluate hands-on programming skills. We can also restrict the coding questions to be solved only using a particular programming language if you job description expects a specific language.

Can I evaluate SQL and NoSQL (like MongoDB) in the same tesT?

Yes. You can review our standard MongoDB test to get a sense of what questions are asked to evaluate MongoDB skills. In the final assessment you will have questions to evaluate SQL and MongoDB in the same test.

Can I evaluate other relevant skills like Python in the same test?

Yes. We support screening multiple skills in a single test. You can review our standard Python test to understand what type of questions we use to evaluate Python skills. Once you sign up for any plan, you can request a custom assessment that will be customized to your job description. The customized assessment will include questions for all the must-have skills required for your SQL role.

What is a custom assessment?

Every role is different and requires a custom assessment to identify top candidates efficiently. Adaface subject matter experts understand your job description/ role requirements and pick the most relevant questions from our library of 10000+ questions to create a technical assessment that helps you find the qualified candidates in your candidate pipeline quickly. All custom assessments are set up based on the job description, role requirements, must-have skills, experience level and salary range within a maximum of 48 hours and you will get an email notification once it goes live.

Check out a sample assessment here (no credit card required).

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.

How is Adaface different from other assessment tools?

We believe that status quo tech assessment platforms are not a fair way for companies to evaluate engineers because they focus on trick questions/ puzzles/ niche algorithms. We started Adaface to help companies find great engineers by assessing on-the-job skills required for a role. Read more about why we started Adaface.

Here's what's different with Adaface:

  • High quality non-googleable questions that test for on-the-job skills as opposed to theoretical knowledge.
  • A friendly conversational assessment with a chatbot, instead of sending a "test" to a candidate. This translates to a higher completion rate. Adaface assessments (86% candidate completion rate), as opposed to traditional tests (40-50% candidate completion rate)
  • Customized assessments for 700+ skills at different experience levels.

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

We have the following anti-cheating features in place:

  • Web proctoring
  • Webcam proctoring
  • Plagairism detection
  • Non-googleable questions
  • Secure browser

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?

The platform is completely self-serve, so here's one way to proceed:

  • You can sign up for free to get a feel for how it works.
  • The free trial includes one sample assessment (Java/ JavaScript) that you will find in your dashboard when you sign up. You can use it to review the quality of questions, and the candidate experience of a conversational test on Adaface.
  • To review the quality of questions, you can also review our public questions for 50+ skills here.
  • Once you're convinced that you want to try it out with real assessments and candidates, you can pick a plan according to your requirements.

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.

With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!

Brandon Lee, Head of People, Love, Bonito

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