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.

Alert Service


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.



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
   firstName VARCHAR(30) NOT NULL,
   lastName VARCHAR(30) NOT NULL



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

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

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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.

Driver Exam, Read First Line, Roads, Document Store, Max Sum, Log Patch, Shipping, Read Write Execute, Procedural Generator, Segment, ATM Locations, Authors, Autocomplete, Ban Users, Bank Branches, Chain Link, Cheapest Product, Classroom, Countries, 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, Tasks, Youngest Child, Node, Paragraph, Platformer, Product Refactoring, Snapshot, Sort Params, Unique Numbers, Username, Vectors, Weighted Average, Window Manager, Language Teacher, Delete Orders, Book Sale, Friend, Average Salary, Auto Show, Poll, Shelf Test, Department Report, Stories, Prefix, Student Rankings, Student Max Score, Adder, Moving Total, Shining Star, Car Rental, Paper Strip, Ingredients, Crop Ratio, Bicycle, Users and Accounts, Matching Clothes, Agents, River Discharge, Nullable Employee, Patient Class, Kilometer Converter, Stack to List, Internal Nodes, Fire Dragon, Log Parser, Ingredient Tuple, Animal Hierarchy, Chinese Box, Manager Sales, String Occurrence, Movie Genres, Student Activities, Worker, Welfare Organization, Date Transform, Transactions, Racer, Unique Product, Flight Connections, XML Navigation, Wheel Defects
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# Exceptions SQL Conditions Views Bug Fixing Language Algorithmic Thinking Extension Methods Arithmetic Strings Random Constraints Create Table Database Schema Select Create Index Performance Tuning Alter Table Linked List Aggregation Subqueries Accessibility Levels Properties Ordering Destructors Memory Management OOP Refactoring Left Join Queue Dictionary Iteration Lists Indexes Union Group by Update Insert Joins Recursion Tree Regex Data Structures Pass by Reference Arrays Inheritance Delete Sorting Graphs SQL CASE Test Case Design Unit Testing Dynamic Programming LINQ Multithreading Synchronization HashSet TDD Integer Division Field Modifiers Right Join Database Normalization Null Coalescing Operator Null Conditional Operator Abstract Class Method Overriding Complexity Stack Higher Order Function Interfaces Serialization XML Tuples CTE Stream Dynamic Objects StringBuilder
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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