PHP, MySQL, and SQL Online Test

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

It's an ideal test for pre-employment screening. A good PHP developer, who is working exclusively on an MySQL server database layer, needs to not only solve problems using PHP, but also to write and analyze SQL queries that are used for communication with the database and to use MySQL-specific features to interface efficiently with a database. 

This online test requires candidates to solve coding problems in PHP, answer multiple-choice questions about MySQL and write SQL queries that extract, combine, and manipulate data.

Sample Candidate Report

Sample Free Questions

Paginate Users

3min
  -  
Easy  
  -  
MCA

MySQL Pagination Public

Consider the following table:

CREATE TABLE users (
  id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
  username VARCHAR(50) NOT NULL
);

The following query is used to paginate the table:

SELECT * FROM users ORDER BY username LIMIT 5 OFFSET 15;

Select all the true statements about this method of pagination.

(Select all acceptable answers.)

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

File Owners

10min
  -  
Easy 
  -  
CODE

PHP Associative arrays Public

Implement a groupByOwners function that:

  • Accepts an associative array containing the file owner name for each file name.
  • Returns an associative array containing an array of file names for each owner name, in any order.

For example, for associative array ["Input.txt" => "Randy", "Code.py" => "Stan", "Output.txt" => "Randy"] the groupByOwners function should return ["Randy" => ["Input.txt", "Output.txt"], "Stan" => ["Code.py"]].

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SQL Delete Subqueries Conditions Views PHP Language Exceptions Arrays Strings Stream Arithmetic Update MySQL String functions Aggregation Window functions Common table expression Recursion JSON Pass by reference Constraints Create table Database schema Select Create index Performance tuning Alter table Associative arrays Linked list Interfaces OOP Session Ordering Bug fixing Integer division Regex Insert Left join Iteration Indexes Union Group by Joins Serialization XML Sorting Algorithmic thinking Inheritance SQL CASE CTE
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