Data Warehouse Online Test
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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
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.
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?
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53 more premium Data Warehouse questions
Index Performance, Movies, Matching Clothes, River Discharge, Baby Supplies, Golf Club, Shoe Store, Manager Sales, Agents, New Wages, Research Funding, Guest List, Student Management, Product Data, Projects, Developers, Authors, Autocomplete, Bank Branches, Cheapest Product, Countries, Hospital Patients, Menu Items, Rectangles, Restaurant Menu, Poll, Sales, Employee Manager, Auto Show, Welfare Organization, Tasks, Student Rankings, Student Activities, Youngest Child, Movies Live, Average Salary, Movie Genres, ATM Locations, Transactions, Merge Stock Index, Ban Users, Delete Orders, Department Report, SMS Messages, Ingredients, Roads, Karting Leaderboard, Player Division, Popular Category, Retirees, Users and Accounts, Low Readership, Underpublishing Content.
Skills and topics tested
- SQL
- Indexes
- Performance Tuning
- Aggregation
- Select
- Subqueries
- Conditions
- Joins
- Database Normalization
- Database Schema
- Data Warehouse
- OLAP Cube
- Software Architecture
- Snowflake Schema
- CTE
- Recursion
- Left Join
- Right Join
- Update
- SQL CASE
- Constraints
- Alter Table
- Bug Fixing
- Create Index
- Create Table
- Ordering
- Group by
- Union
- Delete
- Insert
- Views
- Dice
- OLAP Operations
- Pivot
- Drilldown
- Slices
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
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