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About the test

The Ruby and SQL online test assesses candidates' knowledge of programming in the Ruby language as well as their ability to use SQL.

It's an ideal test for pre-employment screening. A good Ruby developer needs to not only solve problems using Ruby but also write and analyze SQL queries used for communication with the database.

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

Sample public questions

Easy
10 min
code
Public
Ruby
Arrays

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

For example, calling unique_names(["Ava", "Emma", "Olivia"], ["Olivia", "Sophia", "Emma"]) should return an array containing Ava, Emma, Olivia, and Sophia in any order.

Easy
7 min
code
Public
SQL
Aggregation
Group by
Select

App usage data are kept in the following table:

TABLE sessions
  id INTEGER PRIMARY KEY,
  userId INTEGER NOT NULL,
  duration DECIMAL NOT NULL

Write a query that selects userId and average session duration for each user who has more than one session.

See the example case for more details.

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59 more premium Ruby and SQL questions

Document Store, Ranges, Log Patch, Shipping, Category Tree, Chain Link, Hobbies, Paragraph, Products, Username, Language Teacher, Crop Ratio, String Occurrence, Roads, Authors, Autocomplete, 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, River Discharge, ATM Locations, Read Write Execute, Read First Line, Transactions, Merge Stock Index, Date Transform, Greeter, Ban Users, Numbers To Text.

Skills and topics tested

  • Ruby
  • Bug Fixing
  • Language
  • Ranges
  • Monkey Patching
  • Arithmetic
  • Exceptions
  • Hash
  • Linked List
  • Arrays
  • Iteration
  • Regex
  • Strings
  • JSON
  • Serialization
  • Sorting
  • Inheritance
  • OOP
  • Integer Division
  • Stream
  • SQL
  • Conditions
  • Views
  • Select
  • Create Index
  • Database Schema
  • Performance Tuning
  • Constraints
  • Create Table
  • Aggregation
  • Subqueries
  • Ordering
  • Indexes
  • Alter Table
  • Group by
  • Update
  • Insert
  • Joins
  • Left Join
  • Right Join
  • Delete
  • SQL CASE
  • Union
  • CTE
  • Database Normalization

For job roles

  • Back-End Developer
  • Ruby Developer
  • SQL Developer
  • Web Developer

Sample candidate report

What others say

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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

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