MySQL Online Test

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About the test

The MySQL online test assesses knowledge of MySQL features and SQL skills using live coding tasks that require writing MySQL stored procedures, triggers, and SQL queries. 

The assessment includes work-sample tasks such as:

  • Using stored procedures and other MySQL features to optimize and refine queries.
  • Writing queries and subqueries that join, group, filter, and aggregate data.
  • Creating new database tables with proper table schema and constraints.

A good database admin, back-end developer, or data analyst working with MySQL needs to be able to take advantage of its functionality to interface with the database efficiently.

Sample public questions

Easy
7 min
code
Public
SQL
Aggregation
Group by
Select

App usage data are kept in the following table:

TABLE sessions
  id INTEGER PRIMARY KEY,
  userId INTEGER NOT NULL,
  duration DECIMAL NOT NULL

Write a query that selects userId and average session duration for each user who has more than one session.

See the example case for more details.

Hard
30 min
code
Public
MySQL
Select
Stored Procedure

An application for testing programmers contains an initial question version and newer question versions, represented by the following schema:

TABLE questions
  id INTEGER NOT NULL PRIMARY KEY
  name VARCHAR(50) NOT NULL
  childId INTEGER
  FOREIGN KEY (childId) REFERENCES questions(id)

The latest question version has childId set to NULL, other question versions will have childId set to the next version. Each question version can be a child of only one other question version.

Finish the findLatestVersion stored procedure so that it returns the latest question version.

See the example case for more details.

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60 more premium MySQL questions

Dot Items, Cargo Concat, Index Performance, Matching Clothes, Reservations Report, Accounts Trigger, Employee Tree, Student Max Score, Manager Sales, Agents, Developers, Authors, Autocomplete, Bank Branches, Cheapest Product, Countries, Hospital Patients, Rectangles, Restaurant Menu, Poll, Sales, Employee Manager, Auto Show, Welfare Organization, Tasks, Student Rankings, Student Activities, Youngest Child, Average Salary, Movie Genres, ATM Locations, Merge Stock Index, Ban Users, Department Report, Ingredients, Roads, Retirees, Student Management, New Wages, Research Funding, Guest List, Player Division, Popular Category, Movies Live, Delete Orders, Users and Accounts, Product Data, Projects, Transactions, River Discharge, SMS Messages, Menu Items, Karting Leaderboard, Movies, Employee Sales, Bill Discount, Cultivated Fields, Customer Paging, Manager Sales, Root Menu.

Skills and topics tested

  • MySQL
  • String Functions
  • Aggregation
  • SQL
  • Indexes
  • Performance Tuning
  • Conditions
  • Joins
  • Select
  • Date Functions
  • Stored Procedure
  • Triggers
  • CTE
  • Recursion
  • Left Join
  • Right Join
  • Bug Fixing
  • Create Index
  • Database Schema
  • Constraints
  • Create Table
  • Subqueries
  • Ordering
  • Group by
  • Update
  • SQL CASE
  • Union
  • Alter Table
  • Insert
  • Views
  • Delete
  • Database Normalization
  • Window Functions
  • Cursors
  • JSON
  • Pagination

For job roles

  • Data Analyst
  • Database Administrator
  • MySQL Database Administrator
  • MySQL Developer
  • SQL Developer

Sample candidate report

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