This C++ Algorithms and SQL Online Test Separates Good From Bad Hires

Check our public questions below

Solve questions to get feedback or
take a practice test and get a free certificate.

Screen with work-sample questions

Work-samples are the best predictor of work performance. 8,000+ companies use TestDome premium questions.

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

Easy
15 min
code
Public
C++
Algorithmic Thinking
Recursion
Tree

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.

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.

For jobseekers: get certified

Earn a free certificate by achieving top 25% on the C++ Algorithms and SQL test with public questions.

Take a Certification Test

Sample silver certificate

Sunshine Caprio

Java and SQL

TestDome
Certificate

TestDome logo on certificate

For companies: premium questions

Buy TestDome to access premium questions that can't be practiced.
Get money back if you find any premium question answered online.

Sign Up to Offer this Test

52 more premium C++ Algorithms and SQL questions

Max Sum, Platformer, Unique Numbers, Window Manager, Book Sale, Friend, Stories, Moving Total, Internal Nodes, Unique Product, 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, River Discharge, ATM Locations, Transactions, Merge Stock Index, Ban Users, Veterinarian, Paper Strip.

Skills and topics tested

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

For job roles

  • Back-End Developer
  • C++ Developer
  • SQL 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

Used by

Solve all your skill testing needs

150+ Pre-made tests

From web development and database administration to project management and customer support. See all pre-made tests.

90+ skills

From JavaScript and SQL to English and customer support. See all questions to filter by skill.

Multi-skills Test

Mix questions for different skills or even custom questions in one test. See an example.

How TestDome works

1

Choose a pre-made test
or create a custom test

2

Invite candidates via
email, URL, or your ATS

3

Candidates take
a test remotely

4

Sort candidates and
get individual reports

Want to know more?

Not exactly what you're looking for?

Related C++ Algorithms and SQL Programming Tests: