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SQL Coding Test

The SQL Coding 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. The test uses a mix of MCQs and hands-on SQL coding questions.

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Screen candidates with a 25 mins test

Test duration:  25 mins
Difficulty level:  Moderate
Availability:  Ready to use
Questions:
  • 5 SQL MCQs
  • 1 SQL Coding Question
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
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Use the SQL Coding Assessment Test to shortlist qualified candidates

The SQL Coding Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

  • Ability to create and manage databases effectively
  • Ability to create and delete tables with proper data types and constraints
  • Ability to perform CRUD operations on tables including insert, update, and delete
  • Ability to write and understand complex queries involving joins and subqueries
  • Ability to use conditional expressions and create procedures for data manipulation
  • Ability to create and work with views for data abstraction
  • Ability to implement indexes for optimizing query performance
  • Ability to utilize string functions for data manipulation and analysis
  • Ability to work with mathematical functions and timestamps for data calculations
  • Ability to handle locks and transactions for data consistency
  • Ability to scale and secure databases for efficient and safe data storage
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Screen candidates with the highest quality 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 Coding Test will be non-googleable.

🧐 Question

Medium

Multi Select
JOIN
GROUP BY
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

Hard

Find the customer with the most spend 2
JOIN
GROUP BY
ORDER BY
Solve
Given details of customers, products, and sales, write an SQL query to find the customer with the highest spend. The customer with the highest spend is the one who has spent the most money on purchases. The query should return the full name of the customer and the total amount spent by the customer rounded off to the nearest integer.
full_name is the concatenation of first_name and last_name separated by a space. Eg:
first_name = 'Alice', last _name = 'Brown' => full_name = 'Alice Brown'
You can assume that there will always be non-empty first_name and non-empty last_name entries for all customers in the table.
 image
🧐 Question🔧 Skill

Medium

Multi Select
JOIN
GROUP BY

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

Hard

Find the customer with the most spend 2
JOIN
GROUP BY
ORDER BY

10 mins

SQL Coding
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Multi Select
JOIN
GROUP BY
SQL
Medium2 mins
Solve
nth highest sales
Nested queries
User Defined Functions
SQL
Medium3 mins
Solve
Select & IN
Nested queries
SQL
Medium3 mins
Solve
Sorting Ubers
Nested queries
Join
Comparison operators
SQL
Medium3 mins
Solve
With, AVG & SUM
MAX() MIN()
Aggregate functions
SQL
Hard2 mins
Solve
Find the customer with the most spend 2
JOIN
GROUP BY
ORDER BY
SQL Coding
Hard10 minsSolve

Test candidates on core SQL Coding Hiring Test topics

Creating databases: This skill involves the creation of databases, which are organized collections of data that can be accessed, managed, and manipulated. It is crucial to assess this skill as it forms the foundation of any database-related tasks and ensures that the test taker has a strong understanding of database concepts and can effectively work with data in a structured manner.

Creating and deleting tables: This skill assesses the ability to create and delete tables, which are structures used to store organized data in a database. Evaluating this skill helps determine if the test taker can design and manage the structure of a database effectively, ensuring data is stored in the appropriate format and can be retrieved efficiently.

CRUD operations on tables: CRUD (Create, Read, Update, Delete) operations refer to the basic actions performed on data in a database table. Testing this skill allows recruiters to see if the test taker is proficient in managing data by creating, reading, updating, and deleting records in a database, which is vital for effectively working with data.

Joins & Subqueries: Join operations combine rows from different tables based on specified conditions, while subqueries are queries nested within another query. Measuring this skill is important to evaluate the test taker's ability to retrieve and combine data from multiple tables using joins, as well as their proficiency in utilizing subqueries for more complex queries.

Conditional expressions and procedures: This skill involves using conditional expressions and procedures to control the flow of data and perform actions based on specific conditions. It is crucial to assess this skill as it determines the test taker's ability to implement logical operations, automate tasks, and handle complex data manipulations based on conditions.

Views: Views are virtual tables derived from the result set of a query. Testing this skill ensures that the test taker can create and utilize views effectively, which provide a simplified and structured way to access and analyze data, helping to improve performance and simplify query writing.

Indexes: Indexes are data structures that improve the speed of data retrieval operations on database tables. Evaluating this skill allows recruiters to see if the test taker understands the importance of creating and managing indexes, which can significantly enhance query performance and optimize the overall efficiency of a database.

String functions: This skill involves the usage of various functions to manipulate and analyze text data within the database. Measuring this skill is important to assess the ability of the test taker to work with string data, perform string manipulations, and apply string functions for tasks such as searching, formatting, and parsing text.

Mathematical functions & Timestamps: This skill assesses the ability to use mathematical functions and work with timestamps (date and time data) within the database. Evaluating this skill is crucial as it ensures the test taker can perform calculations, aggregations, and comparisons using mathematical functions, as well as effectively handle temporal data in database operations.

Locks and Transactions: Locks and transactions are mechanisms used to manage concurrent access and ensure data consistency in multi-user database environments. Measuring this skill is important to determine if the test taker understands the concepts of locks and transactions, and can effectively utilize them to control data integrity, isolation, and concurrency within a database system.

Scale and Security: This skill involves understanding how to design and implement databases that can handle large volumes of data and ensuring the security of sensitive information. Testing this skill allows recruiters to assess the test taker's knowledge and ability to design scalable databases and implement robust security measures, which are critical for managing data in real-world scenarios.

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Have questions about the SQL Coding Hiring Test?

What roles can I use the SQL Coding Assessment Test for?

Here are few roles for which we recommend this test:

  • 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)
Can I combine SQL Coding Test with JavaScript questions?

Yes, recruiters can request a custom test that includes both SQL and JavaScript skills. Check out our JavaScript Online Test for more details.

How to use SQL Coding Test in my hiring process?

Use the SQL Coding Test as a pre-screening tool at the beginning of your recruitment process. Add a link to the test in your job post or invite candidates via email. It helps in finding skilled candidates faster.

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

We have the following anti-cheating features in place:

  • Non-googleable questions
  • IP proctoring
  • Screen proctoring
  • Web proctoring
  • Webcam proctoring
  • Plagiarism detection
  • Secure browser
  • Copy paste protection

Read more about the proctoring features.

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.

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.

Can I get a free trial?

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

What is SQL Coding Test?

The SQL Coding Test evaluates a candidate's ability to work with SQL databases. It is used by recruiters to assess skills in database management and SQL coding. It helps identify candidates proficient in SQL-related tasks.

What topics are covered in the SQL Coding Test?

The test covers creating databases, creating and deleting tables, CRUD operations, joins & subqueries, conditional expressions and procedures, views, indexes, string functions, mathematical functions, and timestamps.

Can I test SQL and MySQL together in a test?

Yes, you can test both SQL and MySQL skills together. This combo is recommended to get a comprehensive evaluation of a candidate’s database management capabilities. Explore our MySQL Online Test.

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.

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.

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.

What is the cost of using this test?

You can check out our pricing plans.

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.

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