C++ Algorithms and SQL Online Test

TestDome skill assessments are used by more than 6800 companies and 450,000 individual test takers.

Jobseekers: Get a Certificate

Companies: Try First, Pay Later

Used by:

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.

Recommended Job Roles

C++ Developer

Back-End Developer

SQL Developer

Sample Candidate Report

Open Sample Report

Sample Free Questions

Students

3min

Easy

CODE

SQL Aggregation 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

Solve Question

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.

Solve Question

Binary Search Tree

15min

Easy

CODE

C++ Algorithmic thinking Data structures Public

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.

Solve Question

Use Free Questions On a Trial Plan

Premium Questions

The premium question library contains our unique, hand-crafted questions. We offer a refund if you find any of them answered online.

Questions

Archive, Runner, Movies, Stories, Index Performance, Tasks, Poll, Rectangles, Read Write Execute, Function Result, Needle, Increment, Non Zero, Document Store, Crop Ratio, Increment, Babushka Doll, Weighted Average, Retirees, Chicken, Authors, Countries, Employee Manager, Merge Stock Index, Paragraph, Username, Chain Link, Hobbies, Node, Cheapest Product, Segment, Shipping, Movies Live, Train, Battery, Out of Range, Stack to Vector, ATM Locations, Autocomplete, Ban Users, Department Report, Developers, Ingredients, Limits, Delete Orders, Restaurant Menu, Roads, Sales, Student Activities, Tiles, Transactions, Projects, Hospital Patients, Bank Branches, Menu Items, Date Transform, Entry, Unique Numbers, Rare, Moving Total, Max Sum, Branches, Platformer, Paper Strip, Friend, Unique Name, Window Manager, Youngest Child, SMS Messages

Skills

C++ Bug fixing Memory management SQL Aggregation Subqueries Dynamic programming Indexes Joins Conditions Arithmetic Strings Data structures Stream Language Insertion OOP Union Iteration Vector Pointers Exceptions Algorithmic thinking Constraints Database Schema Performance tuning Update Conditional statements Delete Views Searching Graphs

Score Distribution

Pricing For Premium Questions

Fully Customizable Tests

Add questions from our question library.

Create your own questions.

Customize test duration, number of questions, passing score, web proctoring, and more.

Create Free Account

Private Concierge

Send us an email with an explanation of your testing needs and a list of candidates. We will create an appropriate test, invite your candidates, review their results, and send you a detailed report.

What Others Say

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

Very smooth, well supported, great for assessing candidates

Very Prompt and helpful support when needed, we were looking to work with a third party to write and set up new tests, testdome was able to quickly set up and support a method to do this, allowing us to start testing candidates straight away.

George Offer, Guided Solutions

Easy to use and efficient for testing developers of different levels

It provides us an opportunity to set our own timing policy, to choose from variety of questions from different areas and with difficulty gradation. Also it is great that TestDome provides free of charge tests for candidates to prepare and check how online IDE works. And support is always ready to help:)

Alexandra Bulka, WorkFusion

On the TestDome Blog

Screening Applicants: The Good, the Bad and the Ugly

Since we’re all biased and we use incorrect proxies, why not just outsource hiring to experts or recruitment agencies? After all, they’ve been screening people for many years, so they must know how to do it right?

Not really. I was surprised to discover that many experts disagree with each other. Everybody praises their pet method and criticises the others. Many of these methods look legitimate, but are based on...