Scala and SQL Online Test

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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.

Recommended Job Roles
Back-End Developer
Scala Developer
SQL Developer
Web Developer
Sample Candidate Report

Sample Free Questions

Students

3min
  -  
Easy  
  -  
CODE

SQL Aggregation Select 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

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.

Merge Names

10min
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Easy 
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CODE

Scala Vector Public New

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.

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Skills
SQL Conditions Views Subqueries Update Scala Exceptions Strings Constraints Create table Database schema Select Create index Performance tuning Alter table Aggregation Ordering Insert Left join Bug fixing Indexes Union Group by Joins Arithmetic Inheritance OOP SQL CASE CTE Delete Lazy Evaluation LazyList
Score Distribution
# of candidates
0-33%
34-66%
67-100%
Score
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