C++ Algorithms and SQL Online Test

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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
  -  
Easy  
  -  
CODE

SQL Aggregation Select 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.

Merge Names

10min
  -  
Easy  
  -  
CODE

C++ Arrays Public

Implement the unique_names method. When passed two vectors of names, it will return a vector containing the names that appear in either or both vectors. The returned vector should have no duplicates.

For example, calling unique_names(std::vector<std::string>{"Ava", "Emma", "Olivia"}, std::vector<std::string>{"Olivia", "Sophia", "Emma"}) should return a vector containing Ava, Emma, Olivia, and Sophia in any order.

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Skills
SQL Conditions Views C++ Algorithmic thinking Vector Subqueries Update Constraints Create table Database schema Select Create index Performance tuning Alter table Aggregation Ordering Insert Left join Bug fixing Queue Indexes Union Group by Joins Arrays Tree Data structures Linked list Unordered map SQL CASE CTE Delete Sorting Graphs Unordered set
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34-66%
67-100%
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