This C# and SQL Online Test
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About the test

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.

Sample public questions

Easy
3 min
mca
Public
C#
Inheritance
OOP

A company is designing the class hierarchy for various cache implementations:

public class Cache {}

public class DiskCache : Cache {}

public class MemoryCache : Cache {}

public class OptimizedDiskCache : DiskCache {}

Select all the answers that will result in a runtime exception.

Easy
7 min
code
Public
SQL
Aggregation
Group by
Select

App usage data are kept in the following table:

TABLE sessions
  id INTEGER PRIMARY KEY,
  userId INTEGER NOT NULL,
  duration DECIMAL NOT NULL

Write a query that selects userId and average session duration for each user who has more than one session.

See the example case for more details.

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98 more premium C# and SQL questions

Driver Exam, Max Sum, Log Patch, Shipping, Classroom, Disposable Wrapper, Document Counter, Eye of the Storm, Node, Paragraph, Product Refactoring, Snapshot, Sort Params, Window Manager, Shining Star, Bicycle, Nullable Employee, Kilometer Converter, Stack to List, Fire Dragon, Log Parser, Ingredient Tuple, Animal Hierarchy, Chinese Box, Worker, Racer, XML Navigation, Roads, Authors, Autocomplete, Bank Branches, Cheapest Product, Countries, Developers, Hospital Patients, Index Performance, Menu Items, Movies, Projects, Rectangles, Restaurant Menu, Retirees, SMS Messages, Poll, Users and Accounts, Matching Clothes, Agents, Sales, Employee Manager, Auto Show, Delete Orders, Welfare Organization, Tasks, Manager Sales, Student Rankings, Student Activities, Youngest Child, Movies Live, Department Report, Ingredients, Average Salary, Movie Genres, Segment, River Discharge, ATM Locations, Ceramic Store, Patient Class, String Occurrence, Username, Book Sale, Language Teacher, Unique Product, Stories, Procedural Generator, Internal Nodes, Weighted Average, Friend, Document Store, Crop Ratio, Hobbies, Platformer, Shelf Test, Read Write Execute, Read First Line, Transactions, Merge Stock Index, Date Transform, Ban Users, Chain Link, Prefix, Unique Numbers, Moving Total, Veterinarian, Car Rental, Wheel Defects, Flight Connections, Paper Strip, Vectors.

Skills and topics tested

  • C#
  • Exceptions
  • Algorithmic Thinking
  • Extension Methods
  • Arithmetic
  • Accessibility Levels
  • Properties
  • Destructors
  • Memory Management
  • OOP
  • Refactoring
  • Recursion
  • Tree
  • Regex
  • Strings
  • Lists
  • Pass by Reference
  • Dictionary
  • Linked List
  • TDD
  • Field Modifiers
  • Null Coalescing Operator
  • Null Conditional Operator
  • Inheritance
  • Method Overriding
  • Complexity
  • Stack
  • Higher Order Function
  • Interfaces
  • Serialization
  • XML
  • LINQ
  • Tuples
  • Abstract Class
  • Data Structures
  • Bug Fixing
  • Multithreading
  • Synchronization
  • Dynamic Objects
  • SQL
  • Conditions
  • Views
  • Select
  • Create Index
  • Database Schema
  • Performance Tuning
  • Constraints
  • Create Table
  • Aggregation
  • Subqueries
  • Ordering
  • Indexes
  • Alter Table
  • Group by
  • Update
  • Insert
  • Joins
  • Left Join
  • Right Join
  • Delete
  • SQL CASE
  • Union
  • CTE
  • Database Normalization
  • Stream
  • Sorting
  • Dynamic Programming
  • Random
  • Arrays
  • Graphs
  • Language
  • Integer Division
  • Iteration
  • Test Case Design
  • Unit Testing
  • HashSet
  • Queue
  • StringBuilder

For job roles

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

Sample candidate report

What others say

Decorative quote

Simple, straight-forward technical testing

TestDome is simple, provides a reasonable (though not extensive) battery of tests to choose from, and doesn't take the candidate an inordinate amount of time. It also simulates working pressure with the time limits.

Jan Opperman, Grindrod Bank

Product reviews

G2 High Performer 2022G2 Read Our Reviews

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