This Scala and SQL Online Test Separates Good From Bad Hires

Check our public questions below

Solve questions to get feedback or
take a practice test and get a free certificate.

Screen with work-sample questions

Work-samples are the best predictor of work performance. 8,000+ companies use TestDome premium questions.

About the test

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

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

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

Sample public questions

Easy
10 min
code
Public
Scala
Vector

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

For example, calling MergeNames.uniqueNames(Vector("Ava", "Emma", "Olivia"), Vector("Olivia", "Sophia", "Emma")) should return a vector 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.

For jobseekers: get certified

Earn a free certificate by achieving top 25% on the Scala and SQL test with public questions.

Take a Certification Test

Sample silver certificate

Sunshine Caprio

Java and SQL

TestDome
Certificate

TestDome logo on certificate

For companies: premium questions

Buy TestDome to access premium questions that can't be practiced.
Get money back if you find any premium question answered online.

Sign Up to Offer this Test

45 more premium Scala and SQL questions

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, River Discharge, ATM Locations, Language Teaching, Weighted Average, Read First Line, Transactions, Merge Stock Index, Ban Users, Prefix, Numbers To Text.

Skills and topics tested

  • SQL
  • Conditions
  • Views
  • Select
  • Create Index
  • Database Schema
  • Performance Tuning
  • Constraints
  • Create Table
  • Aggregation
  • Subqueries
  • Ordering
  • Bug Fixing
  • Indexes
  • Alter Table
  • Group by
  • Update
  • Insert
  • Joins
  • Left Join
  • Right Join
  • Delete
  • SQL CASE
  • Union
  • CTE
  • Database Normalization
  • Scala
  • Inheritance
  • OOP
  • Arithmetic
  • Exceptions
  • Lazy Evaluation
  • LazyList
  • Strings

For job roles

  • Back-End Developer
  • Scala Developer
  • SQL Developer
  • Web Developer

Sample candidate report

What others say

Decorative quote

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

Product reviews

G2 High Performer 2022G2 Read Our Reviews

Used by

Solve all your skill testing needs

150+ Pre-made tests

From web development and database administration to project management and customer support. See all pre-made tests.

90+ skills

From JavaScript and SQL to English and customer support. See all questions to filter by skill.

Multi-skills Test

Mix questions for different skills or even custom questions in one test. See an example.

How TestDome works

1

Choose a pre-made test
or create a custom test

2

Invite candidates via
email, URL, or your ATS

3

Candidates take
a test remotely

4

Sort candidates and
get individual reports

Want to know more?

Not exactly what you're looking for?

Related Scala and SQL Programming Tests: