JavaScript and SQL Online Test

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The JavaScript and SQL online test assesses candidates' knowledge of programming in the JavaScript language as well as their ability to use SQL.

It's an ideal test for pre-employment screening. A good JavaScript developer needs to not only solve problems using JavaScript but also write and analyze SQL queries used for communication with the database.

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

Recommended Job Roles
JavaScript Developer
SQL Developer
Web Developer
Web Front-End Developer
Sample Candidate Report

Sample Free Questions

Ensure

3min
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Easy  
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CODE

JavaScript Error handling Language Public

Implement the ensure function so that it throws an error if called without arguments or the argument is undefined. Otherwise it should return the given value.

Students

3min
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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.

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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
Filter, Positive Numbers, Function Wrapper, Double, Truthy Expressions, Roads, Table of Names, Word Count, Cards, New Folder, Log Patch, Loading Bar, Ingredients, Array Search, Reorder, Segment, Hobbies, A Tag, ATM Locations, Authors, Autocomplete, Ban Users, Bank Branches, Cheapest Product, Confirm, Countries, Date Transform, Department Report, Developers, Employee Manager, Height, Hide Button, Hospital Patients, Index Performance, Menu Items, Merge Stock Index, Movies, Movies Live, Projects, Rectangles, Restaurant Menu, Retirees, Sales, SMS Messages, Student Activities, Tasks, Transactions, Youngest Child, Log Parser, Paragraph, Post Comment, Product Rating, Products, Row Appender, Scale Font Size, Snapshot, Username, Vectors, Welfare Organization, Manager Sales, Delete Orders, Validation, Timer, Screen, Student Max Score, Average Salary, Movie Genres, Student Rankings, Auto Show, Poll
Skills
JavaScript Arrays Closures Exceptions DOM manipulation Event handling Language SQL Conditions Views Strings Monkey patching HTML5 Subqueries Update Recursion Arithmetic Iteration Attribute manipulation Constraints Create table Database schema Select Create index Performance tuning Alter table Aggregation Dialog box Ordering Regex Insert Left join Bug fixing Objects Asynchronous calls Indexes Union Group by Joins Serialization XML Content manipulation JSON Sorting Styling SQL CASE CTE Delete Forms Callback Classes ECMAScript 2015
Score Distribution
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