This Java and SQL Online Test
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About the test

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.

Sample public questions

A company is designing the class hierarchy for various cache implementations:

public class Cache {}

public class DiskCache extends Cache {}

public class MemoryCache extends Cache {}

public class OptimizedDiskCache extends DiskCache {}

Select all the answers that will result in a runtime exception.

Java
Inheritance
OOP
Easy
3 min
mca
Public

Given the following data definition, write a query that returns the number of students whose first name is John.

TABLE students
   id INTEGER PRIMARY KEY,
   firstName VARCHAR(30) NOT NULL,
   lastName VARCHAR(30) NOT NULL
SQL
Aggregation
Select
Easy
3 min
code
Public

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90 more premium Java and SQL questions

  Document Store,   Driver Exam,   Shipping,   Chain Link,   Document Counter,   Hobbies,   Node,   Paragraph,   Product,   Snapshot,   Snow Storm,   Test Results,   Username,   Utilities,   Weighted Average,   Language Teacher,   Shining Star,   Mock Library,   Kilometer Converter,   Crop Ratio,   Integer Utilities,   Procedural Generator,   Config Element,   Stack to List,   Fire Dragon,   Log Parser,   String Occurrence,   Worker,   Racer,   Roads,   Authors,   Autocomplete,   Ban Users,   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,   Segment,   River Discharge,   ATM Locations,   Ceramic Store,   Patient Class,   Shelf Test,   Read Write Execute,   Read First Line,   Transactions,   Max Sum,   Veterinarian,   Platformer,   Unique Numbers,   Book Sale,   Friend,   Stories,   Moving Total,   Car Rental,   Paper Strip,   Internal Nodes,   Unique Product,   Wheel Defects,   Flight Connections,   Merge Stock Index,   Date Transform.

Skills and topics tested

  • Java
  • Bug Fixing
  • Language
  • Exceptions
  • Arithmetic
  • Linked List
  • OOP
  • Refactoring
  • HashMap
  • Iteration
  • Lists
  • Recursion
  • Tree
  • Regex
  • Strings
  • Accessibility Levels
  • ArrayList
  • Stream API
  • Class Modifiers
  • Inheritance
  • TDD
  • Dynamic Proxy Classes
  • Method Overriding
  • Integer Division
  • Performance Tuning
  • Random
  • Generics
  • Complexity
  • Stack
  • Higher Order Function
  • Interfaces
  • Serialization
  • XML
  • Stream
  • Memory Management
  • Multithreading
  • Synchronization
  • SQL
  • Conditions
  • Views
  • Select
  • Create Index
  • Database Schema
  • Alter Table
  • Constraints
  • Create Table
  • Aggregation
  • Subqueries
  • Ordering
  • Indexes
  • Group by
  • Update
  • Insert
  • Joins
  • Left Join
  • Right Join
  • Delete
  • SQL CASE
  • Union
  • CTE
  • Database Normalization
  • Abstract Class
  • Test Case Design
  • Unit Testing
  • Algorithmic Thinking
  • Queue
  • Data Structures
  • Sorting
  • Graphs
  • Dynamic Programming
  • HashSet
  • Arrays
  • StringBuilder

For job roles

  • Back-End Developer
  • Java Developer
  • SQL Developer
  • Web Developer

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