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About the test

The C# Algorithms and SQL online test assesses candidates' knowledge of SQL queries and evaluates their algorithmic-thinking skills using C#.

It's an ideal test for pre-employment screening. A good developer should be able to work closely with the database layer and solve back-end problems where any improvement to computational complexity would produce a significantly more efficient solution.

This online test requires candidates to design and analyze algorithms using C# and to write SQL queries that extract, combine, and manipulate data.

Sample public questions

A three-node binary tree.Binary search tree (BST) is a binary tree where the value of each node is larger or equal to the values in all the nodes in that node's left subtree and is smaller than the values in all the nodes in that node's right subtree.

Write a function that, efficiently with respect to time used, checks if a given binary search tree contains a given value.

For example, for the following tree:

  • n1 (Value: 1, Left: null, Right: null)
  • n2 (Value: 2, Left: n1, Right: n3)
  • n3 (Value: 3, Left: null, Right: null)

Call to Contains(n2, 3) should return true since a tree with root at n2 contains number 3.

C#
Algorithmic Thinking
Recursion
Tree
Easy
15 min
code
Public

Given the following data definition, write a query that returns the number of students whose first name is John.

TABLE students
   id INTEGER PRIMARY KEY,
   firstName VARCHAR(30) NOT NULL,
   lastName VARCHAR(30) NOT NULL
SQL
Aggregation
Select
Easy
3 min
code
Public

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56 more premium C# Algorithms and SQL questions

  Max Sum,   Veterinarian,   Unique Numbers,   Window Manager,   Moving Total,   Car Rental,   Chinese Box,   Roads,   Authors,   Autocomplete,   Ban Users,   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,   River Discharge,   ATM Locations,   Book Sale,   Unique Product,   Stories,   Internal Nodes,   Friend,   Paper Strip,   Platformer,   Wheel Defects,   Flight Connections,   Transactions,   Merge Stock Index.

Skills and topics tested

  • C#
  • Algorithmic Thinking
  • Queue
  • Dictionary
  • Linked List
  • HashSet
  • Sorting
  • Data Structures
  • SQL
  • Conditions
  • Views
  • Select
  • Create Index
  • Database Schema
  • Performance Tuning
  • Alter Table
  • Constraints
  • Create Table
  • Aggregation
  • Subqueries
  • Ordering
  • Bug Fixing
  • Indexes
  • Group by
  • Update
  • Insert
  • Joins
  • Left Join
  • Right Join
  • Delete
  • SQL CASE
  • Union
  • CTE
  • Database Normalization
  • Dynamic Programming
  • Arrays
  • Tree
  • Graphs
  • StringBuilder
  • Strings

For job roles

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

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