C# and SQL Online Test

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The C# and SQL online test assesses candidates' knowledge of programming in the C# language and their ability to use SQL.

It's an ideal test for pre-employment screening. A good C# developer needs to be able not only to solve problems using C# but also to write and analyze SQL queries to access a database.

This online test requires candidates to solve coding problems in C# and to write SQL queries that extract, combine, and manipulate data.

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Free Sample Questions for C# and SQL Test

Our sample questions are free for companies to use on a trial plan. See more about our premium questions for paid plans below.

Students

3min
  -  
Easy  
  -  
CODE

SQL Aggregation Select Public

Given the following data definition, write a query that returns the number of students whose first name is John. String comparisons should be case sensitive.

TABLE students
   id INTEGER PRIMARY KEY,
   firstName VARCHAR(30) NOT NULL,
   lastName VARCHAR(30) NOT NULL

Enrollment

5min
  -  
Easy  
  -  
CODE

SQL Conditions Update Public

A table containing the students enrolled in a yearly course has incorrect data in records with ids between 20 and 100 (inclusive).

TABLE enrollments
  id INTEGER NOT NULL PRIMARY KEY
  year INTEGER NOT NULL
  studentId INTEGER NOT NULL

Write a query that updates the field 'year' of every faulty record to 2015.

Alert Service

10min
  -  
Easy  
  -  
CODE

C# Interfaces Inversion of control Refactoring Public

Refactor the AlertService and AlertDAO classes:

  • Create a new interface, named IAlertDAO, that contains the same methods as AlertDAO.
  • AlertDAO should implement the IAlertDAO interface.
  • AlertService should have a constructor that accepts IAlertDAO.
  • The RaiseAlert and GetAlertTime methods should use the object passed through the constructor.
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Premium Questions for C# and SQL Test

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Covered Skills

Testing of these skills is covered in this pre-built test because they’re closely related. On our paid plan, you can easily create your own custom multi-skill tests.

C# Stream Strings Exceptions SQL Conditions Views Bug fixing Language Algorithmic thinking Arrays Extension methods Arithmetic Data structures Subqueries Update TDD Sorting Random Memory management Constraints Create table Database schema Select Create index Performance tuning Alter table Field modifiers Linked list Aggregation Accessibility levels Properties Ordering Integer division Regex Destructors OOP Refactoring Left join Queue Dictionary Iteration Lists Indexes Union Group by Insert Joins Tree Serialization XML Recursion Multithreading Synchronization StringBuilder Pass by reference Complexity Stack Inheritance CTE Delete Graphs SQL CASE Test case design Unit testing HashSet Method overriding Dynamic programming Higher order function Interfaces LINQ
Recommended Job Roles

These are the job roles that we recommend for the C# and SQL online test.

.NET Developer
Back-End Developer
C# Developer
SQL Developer
Web Developer
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