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

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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. String comparisons should be case sensitive.

TABLE students
   id INTEGER PRIMARY KEY,
   firstName VARCHAR(30) NOT NULL,
   lastName VARCHAR(30) NOT NULL

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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.

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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.

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Skills

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

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