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
Back-End Developer
C++ Developer
SQL Developer
Sample Candidate Report

Sample Free Questions

Students

3min
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Easy  
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CODE

SQL Aggregation 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
   id INTEGER PRIMARY KEY,
   firstName VARCHAR(30) NOT NULL,
   lastName VARCHAR(30) NOT NULL

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.

Binary Search Tree

15min
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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.

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Questions
Movies, Index Performance, Poll, Rectangles, Increment, Non Zero, Document Store, Crop Ratio, Increment, Babushka Doll, Retirees, Chicken, Authors, Countries, Employee Manager, Merge Stock Index, Chain Link, Node, Cheapest Product, Movies Live, ATM Locations, Department Report, Developers, Delete Orders, Restaurant Menu, Roads, Sales, Student Activities, Transactions, Projects, Youngest Child, Battery, Hobbies, Out of Range, Tiles, Needle, Date Transform, Username, Limits, Internal Nodes, Entry, Window Manager, Moving Total, Rare, Max Sum, Unique Name, Paper Strip, Friend, Unique Numbers, Stories, Train, Runner, Archive, Platformer, Shipping, Tasks, Weighted Average, Ingredients, Autocomplete, Bank Branches, Hospital Patients, Menu Items, Ban Users, Paragraph, Function Cache, Stack to Vector, Read Write Execute, SMS Messages, Segment
Skills
SQL Aggregation Subqueries Indexes Conditions C++ Language Bug fixing Memory management Insertion OOP Joins Union Data structures Constraints Database schema Delete Update Views Pointers Iteration Vector Exceptions Stream Strings Conditional statements Algorithmic thinking Searching Graphs Dynamic programming Arithmetic Performance tuning
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