Data Warehouse Online Test

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About the test

The Data Warehouse online test assesses knowledge of creating and administering data warehouses. This test includes SQL live coding tasks that require writing CRUD operations in order to extract, combine, and manipulate data.

The assessment includes solving work-sample tasks such as:

  • Converting relational models to a snowflake or star schema.
  • Creating and transforming OLAP cubes.
  • Writing SQL queries and subqueries that join, group, filter, and aggregate data.

A good Data Warehouse Developer or Administrator needs a solid understanding of data warehouse systems and SQL in order to design and access a data warehouse efficiently.

Sample public questions

7 min
Group by

App usage data are kept in the following table:

TABLE sessions

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.

3 min
Data Warehouse
OLAP Operations

Management of a multinational news company would like to see how the number of viewers of different news sections varies per country, for each day.

The data is in an OLAP cube and needs to be transformed to get the data the management is looking for. Below are the diagrams of starting and expected OLAP cubes:

An OLAP cubeAn OLAP cube

What operations should be performed to transform the first OLAP cube into the second OLAP cube?

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Sunshine Caprio

Java and SQL
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53 more premium Data Warehouse questions

Index Performance, Matching Clothes, Baby Supplies, Golf Club, Shoe Store, 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, Low Readership, Underpublishing Content.

Skills and topics tested

  • SQL
  • Indexes
  • Performance Tuning
  • Conditions
  • Joins
  • Select
  • Data Warehouse
  • OLAP Cube
  • Software Architecture
  • Snowflake Schema
  • Aggregation
  • CTE
  • Recursion
  • Left Join
  • Right Join
  • Bug Fixing
  • Create Index
  • Database Schema
  • Constraints
  • Create Table
  • Subqueries
  • Ordering
  • Group by
  • Update
  • Union
  • Alter Table
  • Insert
  • Views
  • Delete
  • Database Normalization
  • Dice
  • OLAP Operations
  • Pivot
  • Drilldown
  • Slices

For job roles

  • Big Data Engineer
  • Data Warehouse Administrator
  • Data Warehouse Developer

Sample candidate report

What others say

Decorative quote

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

G2 - Crowd Badge
G2 - High Performer (2022)
Capterra - 4.5 Stars
Capterra - Shortlist (2023)

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