C# & SQL Online Test

Q: What are the main technical tests?

Some key technical tests include: C# & .NET Test JavaScript & HTML/CSS Test Python Online Test SQL Online Test

The C# SQL Test uses scenario-based MCQs to evaluate candidates on their understanding of C# programming language and SQL databases. The test assesses candidates on their knowledge of C# syntax, object-oriented programming (OOP) concepts, and .NET framework, as well as their ability to write and debug C# code. It also evaluates their familiarity with SQL syntax and usage, SQL commands for creating, querying, and modifying relational databases and tables, database design, normalization, and indexing, and their ability to write efficient and optimized SQL queries in C#.

Covered skills:

C# Syntax Basics
C# OOPs
C# Data structures
SQL CRUD Operations
SQL Joins and Indexes
C# Programming

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About the C# & SQL Test

The C# & SQL Online 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:

Understanding and implementing C# syntax basics
Applying object-oriented programming concepts in C#
Working with various data structures in C#
Performing CRUD operations in SQL
Utilizing joins and indexes effectively in SQL
Applying C# programming skills 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 C# & SQL Test will be non-googleable.

🧐 Question
Hard Classes and Constructors OOPs Polymorphism Object-oriented Programming	Solve
What is the output of the following C# code?
Easy Arrays and Exceptions Arrays Exceptions	Solve
What is the output of the following C# code?
Medium Multiple Namespaces Namespace Management	Solve
Class Student exists in both firstnamespace and secondnamespace namespaces. Which of the following are the correct ways to use the Student class?
Medium Static and constructors OOPs	Solve
What is the output of the following C# code?
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?
Easy Registration Queue Logic Queues Sorting By Custom Order	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
Medium Visitors Count Strings Logic String Parsing Character Counting	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill
	Hard Classes and Constructors OOPs Polymorphism Object-oriented Programming	2 mins C#	Solve
What is the output of the following C# code?
	Easy Arrays and Exceptions Arrays Exceptions	2 mins C#	Solve
What is the output of the following C# code?
	Medium Multiple Namespaces Namespace Management	2 mins C#	Solve
Class Student exists in both firstnamespace and secondnamespace namespaces. Which of the following are the correct ways to use the Student class?
	Medium Static and constructors OOPs	3 mins C#	Solve
What is the output of the following C# code?
	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?
	Easy Registration Queue Logic Queues Sorting By Custom Order	30 mins Coding	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	Medium Visitors Count Strings Logic String Parsing Character Counting	30 mins Coding	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill	💪 Difficulty	⌛ Time
	Classes and Constructors OOPs Polymorphism Object-oriented Programming	C#	Hard	2 mins	Solve
What is the output of the following C# code?
	Arrays and Exceptions Arrays Exceptions	C#	Easy	2 mins	Solve
What is the output of the following C# code?
	Multiple Namespaces Namespace Management	C#	Medium	2 mins	Solve
Class Student exists in both firstnamespace and secondnamespace namespaces. Which of the following are the correct ways to use the Student class?
	Static and constructors OOPs	C#	Medium	3 mins	Solve
What is the output of the following C# code?
	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?
	Registration Queue Logic Queues Sorting By Custom Order	Coding	Easy	30 mins	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	Visitors Count Strings Logic String Parsing Character Counting	Coding	Medium	30 mins	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

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Why you should use Pre-employment C# & SQL Online Test?

The C# & SQL 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:

C# Syntax Basics
C# OOPs
C# Data structures
SQL CRUD Operations
SQL Joins and Indexes
C# Programming
Exception handling in C#
Object-oriented design principles in C#
Understanding and implementing algorithms in C#
Relational database concepts and design in SQL

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 C# & SQL Online Test?

C# Syntax Basics: C# Syntax Basics refers to the foundational rules and structure used to write C# code. This includes understanding data types, variables, operators, control structures, and basic input/output operations. Assessing this skill ensures that candidates have a solid understanding of the fundamental building blocks of C# programming.

C# OOPs: C# OOPs (Object-Oriented Programming) involves designing and creating classes, objects, and their interactions to solve real-world problems. This skill measures a candidate's ability to utilize object-oriented principles such as encapsulation, inheritance, and polymorphism to develop flexible and modular code.

C# Data structures: C# Data structures are containers for organizing and storing data efficiently. This includes arrays, lists, queues, stacks, and dictionaries. Evaluating this skill helps assess a candidate's understanding of the different types of data structures and their application in solving complex programming challenges.

SQL CRUD Operations: SQL CRUD (Create, Read, Update, Delete) Operations involve manipulating data stored in a database. This skill tests a candidate's proficiency in writing SQL statements to perform operations such as inserting records, retrieving data, updating existing records, and deleting records from database tables.

SQL Joins and Indexes: SQL Joins and Indexes are important concepts in database management that facilitate efficient and optimized data retrieval. This skill measures a candidate's ability to write SQL queries that involve joining tables based on common columns and utilizing indexes to improve query performance.

C# Programming: C# Programming assesses a candidate's overall knowledge and proficiency in the C# programming language. This includes a combination of syntax, object-oriented concepts, data structures, and problem-solving skills. Evaluating this skill provides recruiters with a comprehensive understanding of a candidate's ability to develop applications using C#.

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 C# & SQL Test to be based on.

C# variables

C# data types

C# operators

C# conditional statements

C# loops

C# arrays

C# lists

C# dictionaries

C# classes

C# inheritance

C# interfaces

C# polymorphism

C# encapsulation

C# abstraction

C# exception handling

SQL CREATE statement

SQL INSERT statement

SQL SELECT statement

SQL UPDATE statement

SQL DELETE statement

SQL JOIN

SQL INNER JOIN

SQL OUTER JOIN

SQL INDEX

SQL Primary Key

SQL Foreign Key

SQL Group By

SQL Order By

SQL Subqueries

C# LINQ

C# Lambda expressions

C# Delegates

C# Events

C# Nullable types

C# Generics

C# Multithreading

SQL Transactions

SQL Stored Procedures

SQL Views

C# File IO

C# Serialization

C# Reflection

C# Regular Expressions

SQL Aggregation functions

SQL Normalization

C# Unit Testing

C# Debugging

SQL Triggers

C# Error handling

SQL Subqueries

C# Exception handling

SQL Constraints

C# Code optimization

C# Memory management

SQL Stored Functions

C# Event-driven programming

C# Design patterns

C# Web services

SQL Views

C# Networking

C# Database connectivity

SQL Joins

C# GUI development

C# Entity Framework

SQL Performance tuning

What roles can I use the C# & SQL Online Test for?

C# Developer
SQL Database Administrator

How is the C# & SQL Online 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

Optimizing SQL queries for performance
Database normalization and denormalization in SQL
Working with collections and generics in C#
Understanding and using LINQ in C#
Working with stored procedures in SQL
Understanding and implementing inheritance in C#
Understanding and using indexing in SQL
Implementing multithreading and asynchronous programming in C#
Understanding and using transactions in SQL
Testing and debugging in C#

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 C# & SQL Hiring Test?

What is the C# & SQL Test?

The C# & SQL Test assesses candidates' proficiency in C# and SQL. It is designed for recruiters to evaluate skills relevant to both programming and database management, facilitating efficient hiring of capable developers.

Can I combine C# & SQL Test with other skills?

Yes, recruiters can request a custom test with multiple skills. For example, you can combine the C# & SQL Test with the JavaScript & HTML/CSS Test to assess front-end skills.

What topics are covered in the C# & SQL Test?

The test covers C# syntax, OOPs, data structures, SQL CRUD operations, joins, indexing, and more. Senior-level questions focus on optimizing queries, using LINQ, and implementing multithreading.

How to use the C# & SQL Test in my hiring process?

Use this test as a pre-screening tool early in your recruitment. Add the test link in your job post or directly invite candidates via email.

What are the main technical tests?

Some key technical 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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