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

Easy
3 min
mca
Public
Data Warehouse
Drilldown
OLAP Operations
Pivot

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?

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.

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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

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