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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

TestDome offers a premium questions library with 1000+ unique, hand-crafted questions whose answers can’t be found online. If you spot an answer somewhere online, we’ll give you a refund.

Question Names

These premium questions are included in this pre-built test and can be added to any multi-skill test. Please sign up for a paid plan to view the questions in detail.

Needle, Driver Exam, Read First Line, Roads, Document Store, Max Sum, Log Patch, Shipping, Chinese Box, Read Write Execute, Procedural Generator, Runner, Segment, ATM Locations, Authors, Autocomplete, Ban Users, Bank Branches, Bicycle, Chain Link, Cheapest Product, Classroom, Countries, Date Transform, Developers, Disposable Wrapper, Document Counter, Employee Manager, Veterinarian, Eye of the Storm, Hobbies, Hospital Patients, Index Performance, Menu Items, Merge Stock Index, Movies, Movies Live, Projects, Rectangles, Restaurant Menu, Retirees, Sales, SMS Messages, Student Activities, Tasks, Transactions, Youngest Child, Internal Nodes, Log Parser, Node, Paragraph, Platformer, Product Refactoring, Racer, Remove Repetitions, Snapshot, Sort Params, Stack to List, Ship, Unique Product, Unique Numbers, Username, Vectors, Weighted Average, Window Manager, Language Teacher, Delete Orders, Book Sale, Friend, Average Salary, Movie Genres, Auto Show, Poll, Shelf Test, Department Report, Stories, Prefix, Student Rankings, Welfare Organization, Student Max Score, Adder, XML Navigation, Flight Connections, Moving Total, Agents, River Discharge, Users and Accounts, Matching Clothes, Shining Star, Manager Sales, Kilometer Converter, Car Rental, Paper Strip, Animal Hierarchy, Patient Class, Nullable Employee, Ingredient Tuple, Goose, Ingredients, Crop Ratio
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 Extension methods Arithmetic Data structures Random Memory management Constraints Create table Database schema Select Create index Performance tuning Alter table Field modifiers Linked list Aggregation Subqueries Accessibility levels Properties Ordering Regex Destructors OOP Refactoring Left join Queue Dictionary Iteration Lists Indexes Union Group by Update Insert Joins Arrays Tree Serialization XML Recursion Multithreading Synchronization StringBuilder Pass by reference Complexity Stack Inheritance Delete Sorting Graphs SQL CASE Test case design Unit testing Dynamic programming LINQ Dynamic Objects HashSet Right join Database normalization TDD CTE Method overriding Abstract class Null coalescing operator Null conditional operator Tuples Higher order function Interfaces Integer division
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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