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.

Alert Service

10min
  -  
Easy  
  -  
CODE

Java Refactoring Public

Refactor the AlertService and MapAlertDAO classes:

  • Create a new package-private interface, named AlertDAO, that contains the same methods as MapAlertDAO.
  • MapAlertDAO should implement the AlertDAO interface.
  • AlertService should have a constructor that accepts AlertDAO.
  • The raiseAlert and getAlertTime methods should use the object passed through the constructor.
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Premium Questions

The premium question library contains our unique, hand-crafted questions. We offer a refund if you find any of them answered online.

Questions
Utilities, Runner, Movies, Index Performance, Poll, Rectangles, Document Store, 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, 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, Tasks, Weighted Average, Ingredients, Autocomplete, Test Results, Bank Branches, Hospital Patients, Menu Items, Ban Users, Product, Unloading Trucks, Shelf, Rare, Stack to List, Read Write Execute, Shining Star, SMS Messages, Document Counter, Snow Storm
Skills
Java OOP Bug fixing Memory management SQL Aggregation Subqueries Indexes Conditions Language Stream Strings Serialization Exceptions Insertion Joins Union Data structures Arrays Iteration Arithmetic Multithreading Constraints Database schema Delete Update Views Algorithmic thinking Searching Graphs Dynamic programming Performance tuning Refactoring Sorting Test case design TDD
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