SQL Online Test

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About the test

The SQL online test assesses SQL skills using live coding tasks that require writing CRUD operations in order to extract, combine, and manipulate data. SQL queries on this test can be executed in MySQL, MS SQL, or SQLite databases.

The assessment includes work-sample tasks such as:

  • Writing queries and subqueries that join, group, filter, and aggregate data.
  • Creating new database tables with proper table schema and constraints.
  • Fixing bugs in existing SQL queries and tuning performance.

A good database admin, back-end developer, or data analyst all need a solid understanding of SQL to interface and access an SQL 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
7 min
code
Public
SQL
Conditions
Select
Subqueries

The following data definition defines an organization's employee hierarchy.

An employee is a manager if any other employee has their managerId set to this employee's id. That means John is a manager if at least one other employee has their managerId set to John's id.

TABLE employees
  id INTEGER NOT NULL PRIMARY KEY
  managerId INTEGER
  name VARCHAR(30) NOT NULL
  FOREIGN KEY (managerId) REFERENCES employees(id)

Write a query that selects only the names of employees who are not managers.

See the example case for more details.

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48 more premium SQL questions

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

Skills and topics tested

  • SQL
  • Conditions
  • Select
  • Create Index
  • Database Schema
  • Performance Tuning
  • Constraints
  • Create Table
  • Aggregation
  • Subqueries
  • Ordering
  • Bug Fixing
  • Indexes
  • Group by
  • Update
  • Alter Table
  • Joins
  • Left Join
  • SQL CASE
  • Union
  • Database Normalization
  • CTE
  • Recursion
  • Right Join
  • Delete
  • Insert
  • Views

For job roles

  • Data Analyst
  • Database Administrator
  • SQL Developer

Sample candidate report

What others say

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Simple, straight-forward technical testing

TestDome is simple, provides a reasonable (though not extensive) battery of tests to choose from, and doesn't take the candidate an inordinate amount of time. It also simulates working pressure with the time limits.

Jan Opperman, Grindrod Bank

Product reviews

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Capterra - Shortlist (2022)

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