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
  -  
Easy  
  -  
CODE

JavaScript 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
  -  
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.

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Questions
Filter, Stopwatch, Movies, Index Performance, Poll, Rectangles, Height, Positive Numbers, Retirees, Authors, Countries, Employee Manager, Merge Stock Index, Paragraph, Post Comment, Row Appender, Hobbies, Cheapest Product, Vectors, Username, Function Wrapper, Anchors, Confirm, Movies Live, Double, Reorder, Hide Button, Truthy Expressions, Array Search, ATM Locations, Department Report, Developers, Delete Orders, Product Rating, Products, Restaurant Menu, Roads, Sales, Snapshot, Student Activities, Table of Names, Transactions, Word Count, Projects, Log Parser, Date Transform, Cards, Youngest Child, SMS Messages, Scale Font Size, New Folder, Screen, Log Patch, Segment, Tasks, Loading Bar, Validation, Ingredients, Autocomplete, Bank Branches, Hospital Patients, Menu Items, Ban Users
Skills
JavaScript Arrays Closures SQL Aggregation Subqueries Indexes Conditions Arithmetic Language Insertion Joins Union Strings DOM manipulation Event handling Iteration Searching Exceptions Recursion Constraints Database Schema Bug fixing Delete Serialization Sorting Update Views Styling Classes ECMAScript 2015 Monkey Patching HTML5 Performance tuning
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