Java and SQL Online Test

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

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

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

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

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

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
  -  
Easy  
  -  
CODE

Java Arrays Public

Implement the uniqueNames 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 MergeNames.uniqueNames(new String[]{'Ava', 'Emma', 'Olivia'}, new String[]{'Olivia', 'Sophia', 'Emma'}) should return an array containing Ava, Emma, Olivia, and Sophia in any order.

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Utilities, Runner, Movies, Index Performance, Poll, Rectangles, Document Store, Read Write Execute, Needle, Log Parser, Driver Exam, Crop Ratio, Programmer Teacher, Retirees, Chicken, Authors, Countries, Employee Manager, Merge Stock Index, Paragraph, Username, Chain Link, Hobbies, Read First Line, Node, Cheapest Product, Shipping, Movies Live, Racer, Stack to List, ATM Locations, Department Report, Developers, Delete Orders, Restaurant Menu, Roads, Sales, Snapshot, Student Activities, Transactions, Projects, Date Transform, Segment, Youngest Child, Internal Nodes, Moving Total, Entry, Unique Numbers, Remove Repetitions, Max Sum, Unique Name, Friend, Paper Strip, Stories, Train, Platformer, Snow Storm, Tasks, Weighted Average, Ingredients, Autocomplete, Test Results, Bank Branches, Hospital Patients, Menu Items, Ban Users, Product, Document Counter, Shining Star, Unloading Trucks, SMS Messages, Shelf, Rare
Skills
Java OOP Bug fixing Memory management SQL Aggregation Subqueries Indexes Conditions Language Arithmetic Strings Stream Serialization Exceptions Insertion Joins Union Data structures Arrays Iteration Multithreading Algorithmic thinking Constraints Database Schema Delete Update Views Searching Graphs Dynamic programming Refactoring Performance tuning TDD Sorting Test case design
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