Ruby and SQL Online Test

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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.

Recommended Job Roles

Back-End Developer

Ruby Developer

SQL Developer

Web 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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Palindrome

10min

Easy

CODE

Ruby Strings Public

A palindrome is a word that reads the same backward or forward.

Write a function that checks if a given word is a palindrome. Character case should be ignored.

For example, is_palindrome("Deleveled") should return true as character case should be ignored, resulting in "deleveled", which is a palindrome since it reads the same backward and forward.

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Questions

Movies, Index Performance, Poll, Rectangles, Document Store, Category Tree, Crop Ratio, Programmer Teacher, Greeter, Retirees, Authors, Countries, Employee Manager, Merge Stock Index, Chain Link, Cheapest Product, Movies Live, ATM Locations, Department Report, Developers, Delete Orders, Restaurant Menu, Roads, Sales, Student Activities, Transactions, Projects, Youngest Child, Read First Line, Read Write Execute, Needle, Products, Numbers to Text, Paragraph, Username, Hobbies, Ranges, Date Transform, Log Patch, Shipping, Segment, Tasks, Ingredients, Autocomplete, Bank Branches, Hospital Patients, Menu Items, Ban Users, SMS Messages

Skills

SQL Aggregation Subqueries Indexes Conditions Ruby Bug fixing Language Data structures OOP Insertion Joins Union Constraints Database Schema Delete Update Views Exceptions Arithmetic Strings Stream Serialization Sorting Arrays Iteration Ranges Monkey Patching Performance tuning

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