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 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.

Alert Service

10min
  -  
Easy 
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CODE

Java Interfaces Inversion of control 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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Skills
Java Bug fixing Language Stream Strings Exceptions Arithmetic SQL Delete Subqueries Conditions Views Algorithmic thinking Graphs Arrays Update Sorting TDD Dynamic programming Memory management Constraints Create table Database schema Select Create index Performance tuning Alter table Linked list Aggregation Higher order function Interfaces OOP Ordering Integer division Regex Insert Left join Refactoring Queue HashMap Iteration Lists Indexes Union Group by Joins Tree Serialization XML Recursion Data structures Accessibility levels Multithreading Synchronization StringBuilder Test case design Unit testing ArrayList Complexity Stack Stream API Class modifiers HashSet Inheritance SQL CASE CTE
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