Data Warehouse Online Test
For Jobseekers
Practice your skills and earn a certificate of achievement when you score in the top 25%.
Take a Practice TestFor Companies
Test candidates with real-world problems and interview the best ones.
Sign Up to Offer this TestAbout 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
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:
What operations should be performed to transform the first OLAP cube into the second OLAP cube?
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.
For jobseekers: get certified
Earn a free certificate by achieving top 25% on the Data Warehouse test with public questions.
Take a Certification TestSample silver certificate
Sunshine Caprio
Java and SQL TestDomeCertificate
For companies: premium questions
Buy TestDome to access premium questions that can't be practiced.
Get money back if you find any premium question answered online.
53 more premium Data Warehouse 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, Baby Supplies, Underpublishing Content, Low Readership, Golf Club, Merge Stock Index, Shoe Store, Ban Users, Manager Sales, Agents, Delete Orders, Department Report, SMS Messages, Ingredients, Roads, New Wages, Research Funding, Karting Leaderboard, Player Division, Guest List, Student Management, Product Data, Popular Category, Projects, Retirees.
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
- Data Warehouse
- OLAP Cube
- Drilldown
- OLAP Operations
- Slices
- Dice
- Pivot
- Software Architecture
- Snowflake Schema
- CTE
- Recursion
- Right Join
- Delete
- Insert
- Views
For job roles
- Big Data Engineer
- Data Warehouse Administrator
- Data Warehouse Developer
Sample candidate report
What others say
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
Used by
Solve all your skill testing needs
150+ Pre-made tests
From web development and database administration to project management and customer support. See all pre-made tests.
90+ skills
From JavaScript and SQL to English and customer support. See all questions to filter by skill.
Multi-skills Test
Mix questions for different skills or even custom questions in one test. See an example.
How TestDome works
Choose a pre-made test
or create a custom test
Invite candidates via
email, URL, or your ATS
Candidates take
a test remotely
Sort candidates and
get individual reports