This Data Warehouse and SQL Online Test Separates Good From Bad Hires

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About the test

The Data Warehouse and SQL online test assesses candidates' knowledge of data warehouses and their ability to use SQL.

It's an ideal test for pre-employment screening of candidates applying for roles such as Big Data Engineers, Data Warehouse Developers, and Data Warehouse Administrators.

This online test requires candidates to answer multiple-choice questions about data warehouses and to write SQL queries that extract, combine, and manipulate data.

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
3 min
code
Public
SQL
Aggregation
Select

Given the following data definition, write a query that returns the number of students whose first name is John.

TABLE students
   id INTEGER PRIMARY KEY,
   firstName VARCHAR(30) NOT NULL,
   lastName VARCHAR(30) NOT NULL

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45 more premium Data Warehouse and SQL questions

Roads, Authors, Autocomplete, Bank Branches, Cheapest Product, Countries, Developers, Hospital Patients, Index Performance, Menu Items, Movies, Projects, Rectangles, Restaurant Menu, Retirees, SMS Messages, Poll, Users and Accounts, Matching Clothes, Agents, Sales, Employee Manager, Auto Show, Delete Orders, Welfare Organization, Tasks, Manager Sales, Student Rankings, Student Activities, Youngest Child, Movies Live, Department Report, Ingredients, Average Salary, Movie Genres, River Discharge, ATM Locations, Transactions, Baby Supplies, Underpublishing Content, Low Readership, Golf Club, Merge Stock Index, Shoe Store, Ban Users.

Skills and topics tested

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

For job roles

  • Big Data Engineer
  • Data Warehouse Administrator
  • Data Warehouse 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

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