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About the test

The C++ and SQL online test assesses candidates' knowledge of programming in the C++ language and their ability to use SQL.

It's an ideal test for pre-employment screening. A good C++ developer needs to be able not only to solve problems using C++ but also to write and analyze SQL queries to access a database.

This online test requires candidates to solve coding problems in C++ and to write SQL queries that extract, combine, and manipulate data.

Sample public questions

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.

C++
Arrays
Easy
10 min
code
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
SQL
Aggregation
Select
Easy
3 min
code
Public

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79 more premium C++ and SQL questions

  Non Zero,   Document Store,   Babushka Doll,   Out of Range,   Max Sum,   Shipping,   Limits,   Archive,   Chain Link,   Veterinarian,   Hobbies,   Node,   Paragraph,   Platformer,   Ship,   Unique Numbers,   Username,   Weighted Average,   Window Manager,   Book Sale,   Friend,   Function Cache,   Stories,   Moving Total,   Increment,   Paper Strip,   Crop Ratio,   Battery,   Stack to Vector,   Internal Nodes,   Fire Dragon,   Kilometer Converter,   String Occurrence,   Worker,   Unique Product,   Roads,   Authors,   Autocomplete,   Ban Users,   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,   Segment,   Tiles,   River Discharge,   ATM Locations,   Read Write Execute,   Transactions,   Merge Stock Index,   Date Transform.

Skills and topics tested

  • C++
  • Bug Fixing
  • Language
  • Memory Management
  • Exceptions
  • Algorithmic Thinking
  • Arithmetic
  • Conditional Statements
  • Destructors
  • Linked List
  • Queue
  • Iteration
  • Map
  • Vector
  • Recursion
  • Tree
  • Regex
  • Strings
  • Data Structures
  • Unordered Map
  • Sorting
  • Graphs
  • Hash and Equals
  • Dynamic Programming
  • Unordered Set
  • Arrays
  • Pointers
  • Integer Division
  • Complexity
  • Stack
  • Higher Order Function
  • Interfaces
  • OOP
  • Inheritance
  • Method Overriding
  • Stream
  • SQL
  • Conditions
  • Views
  • Select
  • Create Index
  • Database Schema
  • Performance Tuning
  • Alter Table
  • Constraints
  • Create Table
  • Aggregation
  • Subqueries
  • Ordering
  • Indexes
  • Group by
  • Update
  • Insert
  • Joins
  • Left Join
  • Right Join
  • Delete
  • SQL CASE
  • Union
  • CTE
  • Database Normalization

For job roles

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

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