SQL Coding Test

Q: What are the main SQL tests?

The main SQL tests include: SQL Online Test MS SQL Test SQL Server Test Oracle PL SQL Online Test PostgreSQL Online 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.

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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About the SQL Coding Assessment Test

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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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 Coding Test will be non-googleable.

🧐 Question
Medium Multi Select JOIN GROUP BY Sql Join Data Analysis	Solve
Consider the following SQL table: How many rows does the following SQL query return?
Medium nth highest sales Nested queries User Defined Functions	Solve
Consider the following SQL table: Which of the following SQL commands will find the ‘nth highest Sales’ if it exists (returns null otherwise)?
Medium Select & IN Nested queries	Solve
Consider the following SQL table: Which of the following SQL queries would return the year when neither a football or cricket winner was chosen?
Medium Sorting Ubers Nested queries Join Comparison operators	Solve
Consider the following SQL table: What will be the first two tuples resulting from the following SQL command?
Hard With, AVG & SUM MAX() MIN() Aggregate functions	Solve
Consider the following SQL table: How many tuples does the following query return?
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.

	🧐 Question	🔧 Skill
	Medium Multi Select JOIN GROUP BY Sql Join Data Analysis	2 mins SQL	Solve
Consider the following SQL table: How many rows does the following SQL query return?
	Medium nth highest sales Nested queries User Defined Functions	3 mins SQL	Solve
Consider the following SQL table: Which of the following SQL commands will find the ‘nth highest Sales’ if it exists (returns null otherwise)?
	Medium Select & IN Nested queries	3 mins SQL	Solve
Consider the following SQL table: Which of the following SQL queries would return the year when neither a football or cricket winner was chosen?
	Medium Sorting Ubers Nested queries Join Comparison operators	3 mins SQL	Solve
Consider the following SQL table: What will be the first two tuples resulting from the following SQL command?
	Hard With, AVG & SUM MAX() MIN() Aggregate functions	2 mins SQL	Solve
Consider the following SQL table: How many tuples does the following query return?
	Hard Find the customer with the most spend 2 JOIN GROUP BY ORDER BY	10 mins SQL Coding	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.

	🧐 Question	🔧 Skill	💪 Difficulty	⌛ Time
	Multi Select JOIN GROUP BY Sql Join Data Analysis	SQL	Medium	2 mins	Solve
Consider the following SQL table: How many rows does the following SQL query return?
	nth highest sales Nested queries User Defined Functions	SQL	Medium	3 mins	Solve
Consider the following SQL table: Which of the following SQL commands will find the ‘nth highest Sales’ if it exists (returns null otherwise)?
	Select & IN Nested queries	SQL	Medium	3 mins	Solve
Consider the following SQL table: Which of the following SQL queries would return the year when neither a football or cricket winner was chosen?
	Sorting Ubers Nested queries Join Comparison operators	SQL	Medium	3 mins	Solve
Consider the following SQL table: What will be the first two tuples resulting from the following SQL command?
	With, AVG & SUM MAX() MIN() Aggregate functions	SQL	Hard	2 mins	Solve
Consider the following SQL table: How many tuples does the following query return?
	Find the customer with the most spend 2 JOIN GROUP BY ORDER BY	SQL Coding	Hard	10 mins	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.

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Why you should use Pre-employment SQL Coding Test?

The SQL Coding Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

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

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the SQL Coding Test?

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.

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 Coding 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 Coding 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 Coding Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

Scale and Security
Query optimization
Database normalization
Stored procedures
Database triggers
Database backup and restoration
Data integrity
Database indexing techniques
Database performance tuning
Database replication

The coding question for experienced candidates will be of a higher difficulty level to evaluate more hands-on experience.

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Have questions about the SQL Coding Hiring 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.

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.

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.

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.

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.

What are the main SQL tests?

The main SQL tests include:

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:

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.

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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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