LINQ Online Test

Q: What are the main database-related tests?

Here are some important database-related tests: SQL Online Test Oracle PL SQL Online Test MySQL Online Test

The LINQ (Language-Integrated Query) Online Test uses scenario-based MCQs to evaluate candidates on their proficiency in LINQ, a powerful query language that enables developers to manipulate data in C# and other .NET languages. The test assesses candidates' ability to write LINQ queries to extract, transform, and filter data, their understanding of LINQ operators, expressions, object-oriented programming, data structures, database programming, debugging, and error handling.

Covered skills:

Query Expressions
Lambda Expressions
Standard Query Operators
Deferred Execution
Join Operations
Aggregation
Grouping
Sorting
Filtering
Data Transformation

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About the LINQ Test

The LINQ 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:

Ability to use Query Expressions effectively
Ability to utilize Lambda Expressions
Ability to apply Standard Query Operators
Understanding of Deferred Execution
Ability to perform Join Operations
Understanding of Aggregation
Ability to work with Grouping
Understanding of Sorting
Ability to apply Filtering
Ability to perform Data Transformation

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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 LINQ Online Test will be non-googleable.

🧐 Question
Medium base code and queries	Solve
Check the following base LINQ code and two LINQ queries that follow: Which of the following statements are true about the output of CODE ONE with base code and CODE TWO with base code?
Easy IEnumerable	Solve
What does the following LINQ code output?

	🧐 Question	🔧 Skill
	Medium base code and queries	4 mins LINQ	Solve
Check the following base LINQ code and two LINQ queries that follow: Which of the following statements are true about the output of CODE ONE with base code and CODE TWO with base code?
	Easy IEnumerable	2 mins LINQ	Solve
What does the following LINQ code output?

	🧐 Question	🔧 Skill	💪 Difficulty	⌛ Time
	base code and queries	LINQ	Medium	4 mins	Solve
Check the following base LINQ code and two LINQ queries that follow: Which of the following statements are true about the output of CODE ONE with base code and CODE TWO with base code?
	IEnumerable	LINQ	Easy	2 mins	Solve
What does the following LINQ code output?

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Why you should use Pre-employment LINQ Online Test?

The LINQ Online 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:

Understanding and implementing Query Expressions
Applying Lambda Expressions for efficient data manipulation
Utilizing Standard Query Operators for filtering and sorting
Understanding Deferred Execution and its impact on performance
Performing Join Operations for integrating multiple data sources
Applying Aggregation functions for summarizing data
Implementing Grouping for organizing data based on specific criteria
Sorting data using multiple criteria
Filtering data based on specific conditions
Performing Data Transformation to convert data into desired formats

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 LINQ Online Test?

Query Expressions: Query expressions in LINQ provide a convenient way to write queries by using a SQL-like syntax. They allow developers to retrieve and manipulate data from various data sources effortlessly.

Lambda Expressions: Lambda expressions are concise and powerful ways to write inline functions. These allow developers to create and use small, anonymous functions that can be used in LINQ queries for filtering, sorting, or transforming data more efficiently.

Standard Query Operators: Standard Query Operators are predefined methods that provide a set of commonly used query operations in LINQ. These operators facilitate tasks such as filtering, projecting, sorting, aggregating, and joining data in a more structured and readable manner.

Deferred Execution: Deferred execution is a feature of LINQ that postpones the actual execution of a query until the data is actually requested. This allows optimization and laziness in the execution of the query, resulting in better performance and memory management.

Join Operations: Join operations in LINQ allow developers to combine data from multiple sources based on specified conditions. This skill is important to measure as it enables the assessment of a candidate's ability to write complex queries involving multiple tables or data sources.

Aggregation: Aggregation in LINQ involves calculating a single value from a collection of values. This skill is important to measure as it demonstrates a candidate's understanding of performing calculations and summarizing data efficiently.

Grouping: Grouping in LINQ allows developers to categorize data based on common attributes or values. This skill is important to measure as it reflects a candidate's ability to organize and analyze data in a structured and meaningful way.

Sorting: Sorting in LINQ involves arranging data in a specific order based on one or more criteria. This skill is important to measure as it indicates a candidate's ability to retrieve and present data in a desired sequence, which is often crucial in data analysis and reporting.

Filtering: Filtering in LINQ refers to the process of selecting specific elements from a collection based on specified conditions. This skill is important to measure as it demonstrates a candidate's ability to extract and retrieve relevant data, which is fundamental in data manipulation and analysis.

Data Transformation: Data transformation in LINQ involves converting data from one form to another, often by applying various operations or functions. This skill is important to measure as it reflects a candidate's ability to manipulate and modify data in different ways to meet specific requirements and goals.

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 LINQ Online Test to be based on.

Basic LINQ Syntax

Query Syntax vs Method Syntax

Filtering Data with LINQ

Sorting Data with LINQ

Grouping Data with LINQ

Aggregating Data with LINQ

Joining Data with LINQ

Lambda Expressions

Deferred Execution and Immediate Execution

Standard Query Operators - Where

Standard Query Operators - Select

Standard Query Operators - OrderBy

Standard Query Operators - GroupBy

Standard Query Operators - Join

Standard Query Operators - Aggregate

Standard Query Operators - Distinct

Standard Query Operators - Any, All, Contains

Standard Query Operators - Skip, Take

Standard Query Operators - Union, Intersect, Except

Standard Query Operators - Concat, Zip

Data Transformation - Select, SelectMany

Data Transformation - GroupBy, ToLookup

Data Transformation - Into

Data Transformation - Cast, OfType, AsQueryable

Data Transformation - Where + Select

Data Transformation - OrderBy + ThenBy

Data Transformation - Join + GroupJoin

Data Transformation - Skip + Take

Deferred Execution - Lazy Loading

Deferred Execution - Eager Loading

Deferred Execution - ToList, ToArray, ToDictionary

Deferred Execution - Count, Average, Min, Max, Sum

Deferred Execution - First, FirstOrDefault, Last, LastOrDefault

Deferred Execution - Any, All

Deferred Execution - Contains

Dot Notation vs Query Syntax

Method Syntax Chaining

Anonymous Types in LINQ

Nullable Types in LINQ

Using LINQ with Collections

Using LINQ with SQL Queries

Combining LINQ with Other Techniques

Performance Optimization of LINQ Queries

Tips and Best Practices for LINQ

LINQ Error Handling and Exception Handling

LINQ Query Optimization

Performance Comparison of Different LINQ Operators

Working with Complex Data Structures

LINQ Integration with Entity Framework

LINQ Integration with WPF and WinForms

LINQ Integration with ASP.NET MVC

LINQ Integration with ASP.NET Web API

LINQ Integration with Xamarin

LINQ Integration with Unity

LINQ Integration with Microsoft Azure

LINQ Integration with MongoDB

LINQ Integration with SQL Server

LINQ Integration with Oracle Database

LINQ Integration with MySQL

LINQ Integration with PostgreSQL

LINQ Integration with SQLite

What roles can I use the LINQ Online Test for?

LINQ Designer
C# .NET Developer
.NET Architect

How is the LINQ 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

Utilizing LINQ functions for querying databases
Optimizing LINQ queries for improved performance
Understanding and implementing advanced LINQ features
Applying LINQ to XML for querying and manipulating XML documents
Using LINQ to Objects for querying in-memory collections
Utilizing LINQ to SQL for database querying and mapping
Implementing LINQ to Entities for querying and working with entity data models
Applying LINQ to DataSet for querying and manipulating relational data
Understanding LINQ expressions and query syntax
Applying LINQ for data analysis and reporting

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Have questions about the LINQ Hiring Test?

What is LINQ Online Test?

The LINQ Online Test assesses a candidate's proficiency in using Language Integrated Query (LINQ) for database and in-memory data operations. It's used by recruiters to determine candidates' abilities in various LINQ functionalities, such as query expressions and lambda expressions.

Can I combine LINQ Online Test with C# questions?

Yes, you can request a custom test that includes both LINQ and C# questions. For more information on assessing C# skills, check out the C# Online Test.

What skills are evaluated in the LINQ Online Test?

The test evaluates skills such as query expressions, lambda expressions, standard query operators, deferred execution, join operations, aggregation, grouping, sorting, filtering, and data transformation.

How to use LINQ Online Test in my hiring process?

Use our assessment software as a pre-screening tool. Add a link to the assessment in your job post or invite candidates via email. This process helps identify skilled candidates early in the recruitment process.

Can I test LINQ and SQL together in a test?

Yes, you can combine LINQ and SQL in a single test. This is recommended to comprehensively evaluate a candidate's data querying skills. Check out the C#, .NET & SQL Test for more details.

What are the main database-related tests?

Here are some important database-related tests:

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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