Now we have lots of challenges, to make the site a little easier to navigate here is a link to all of the individual challenges and their solution posts.
Don't forget to fill out the Participation Tracker. You can check which challenges you have completed here.
2024
Introductory Month
Week 1: Challenge Solution Video Prep Air's Flow Card
Week 2: Challenge Solution Video Average Price Analysis
Week 3: Challenge Solution Video Performance Against Targets
Week 4: Challenge Solution Video Unpopular Seats
Week 5: Challenge Solution Video Getting The Right Data
Intermediate Month
Week 6: Challenge Solution Video Staff Income Tax
Week 7: Challenge Solution Video Valentine's Day
Week 8: Challenge Solution Video Prep Air Loyalty
Week 9: Challenge Solution Video Prep Air Capacity
Week 10: Challenge Solution Video Preppin' for Pulse
Week 11: Challenge Solution Video 13 Months in a Year
Week 12: Challenge Solution Video Graduate Student Loan Repayments
2023
Introductory Month
Week 1: Challenge Solution Video The Data Source Bank
Week 2: Challenge Solution Video International Bank Account Numbers
Week 3: Challenge Solution Video Targets for DSB
Week 4: Challenge Solution Video New Customers
Intermediate Month
Week 5: Challenge Solution Video DSB Ranking
Week 6: Challenge Solution Video DSB Customer Ratings
Week 7: Challenge Solution Video Flagging Fraudulent Suspicions
Week 8: Challenge Solution Video Taking Stock
Advanced Month
Week 9: Challenge Solution Video Customer Bank Statements
Week 10: Challenge Solution Video What's my Balance on this Day?
Week 11: Challenge Solution Video Which Customers are Closest?
Week 12: Challenge Solution Video Regulatory Reporting Alignment
Week 13: Challenge Solution Video Rolling Stock Price Trends
Week 14: Challenge Solution Video World Trade Data
Week 15: Challenge Solution Video Easter Date
Week 16: Challenge Solution Video Easter and Full Moons
Week 17: Challenge Solution Video Population Growth vs Country Size
Week 18: Challenge Solution Video The Nut House Revenue Analysis
Week 19: Challenge Solution Video Tableau Conference Special
Week 20: Challenge Solution Video Dining Hall Debacle
Week 21: Challenge Solution Video Prep School Grades
Week 22: Challenge Solution Video Student Attendance vs Test Scores
Week 23: Challenge Solution Video Is it the teacher or the student? Part 1
Week 24: Challenge Solution Video Is it the teacher or the student? Part 2
Week 25: Challenge Solution Video Prep School 2023 Admissions - Part 1
Week 26: Challenge Solution Video Prep School 2023 Admissions - Part 2
Week 27: Challenge Solution Video The Cost of Running the Prep School
Week 28: Challenge Solution Video Prep School Track Team
Week 29: Challenge Solution Video Moving Averages
Week 30: Challenge Solution Video % Difference From
HR Month
Week 31: Challenge Solution Video Filling in Missing IDs
Week 32: Challenge Solution Video Reshaping Generations
Week 33: Challenge Solution Video Combinations
Week 34: Challenge Solution Video Turnover Rate
Week 35: Challenge Solution Video Transfers
Week 36: Challenge Solution Video C&BSCo 5-a-side
Week 37: Challenge Solution Video Order Sequence Analysis
Week 38: Challenge Solution Video Sustainable Development Goals
Week 39: Challenge Solution Video Tennis 200 Club
Week 40: Challenge Solution Video Prep School Subject Dropouts
Week 41: Challenge Solution Video An International School
Week 42: Challenge Solution Video Prep School "Disco Fever"
Week 43: Challenge Solution Video Best Attendance Awards
Week 44: Challenge Solution Video Prep School Spring Calendar
Week 45: Challenge Solution Video Fill Down
Week 46: Challenge Solution Video Late for School
Week 47: Challenge Solution Video Student GPA
Week 48: Challenge Solution Video Reporting Week Calendars
Week 49: Challenge Solution Video Regular Savings Accounts
Week 50: Challenge Solution Video Regular Savings Accounts - Part 2
Week 51: Challenge Solution Video Elf Toy Production
Week 52: Challenge Solution Video Preppin' Classification
2022
Week 1: Challenge Solution Video The Prep School - Parental Contact Details
Week 2: Challenge Solution Video The Prep School - Birthday Cakes
Week 3: Challenge Solution Video The Prep School - Passing Grades
Week 4: Challenge Solution Video The Prep School - Travel Plans
Week 5: Challenge Solution Video The Prep School - Setting Grades
Week 6: Challenge Solution Video 7 Letter Scrabble Words
Week 7: Challenge Solution Video Call Centre Agent Metrics
Week 8: Challenge Solution Video Pokemon Evolution Stats
Week 9: Challenge Solution Video Customer Classifications
Week 10: Challenge Solution Video The Bechdel test
Week 11: Challenge Solution Video The Prep School - Filling the Blanks
Week 12: Challenge Solution Video Gender Pay Gap
Week 13: Challenge Solution Video Pareto Parameters
Week 14: Challenge Solution Video House of Games Winners
Week 15: Challenge Solution Video Property Management
Week 16: Challenge Solution Video Restaurant Orders
Week 17: Challenge Solution Video The Price of Streaming
Week 18: Challenge Solution Video Un-Pivoting
Week 19: Challenge Solution Video Good Sales, Wrong Sizes
Week 20: Challenge Solution Video TC22 Session Attendance
Week 21: Challenge Solution Video Multi-Sheets of Madness
Week 22: Challenge Solution Video Dungeons & Dragons: Critical Role
Week 23: Challenge Solution Video PD x WOW Salesforce Opportunities
Week 24: Challenge Solution Video Longest Flights
Week 25: Challenge Solution Video Housing Happy Hotel Guests
Week 26: Challenge Solution Video Making Spotify Data Spotless
Week 27: Challenge Solution Video C&BSCo Clean and Aggregate
Week 28: Challenge Solution Video C&BSCo No Sales Today
Week 29: Challenge Solution Video C&BSCo Meeting Targets?
Week 30: Challenge Solution Video C&BSCo Actual Sales Values
Week 31: Challenge Solution Video C&BSCo Preppin' Parameters
Week 32: Challenge Solution Video C&BSCo Mortgage Repayments
Week 33: Challenge Solution Video C&BSCo Next Sale
Week 34: Challenge Solution Video C&BSCo Parameters, Parameters, Parameters
Week 35: Challenge Solution Video C&BSCo Summary Stats
Week 36: Challenge Solution Video Calendar Conundrum
Week 37: Challenge Solution Video Elden Ring Adventure
Week 38: Challenge Solution Video Salesforce Standard Connections for Dreamforce 22
Week 39: Challenge Solution Video Filling in for HR
Week 40: Challenge Solution Video Times Tables
Week 41: Challenge Solution Video Dynamic Times Tables
Week 42: Challenge Solution Video Missing Training Data
Week 43: Challenge Solution Video Missing Training Data 2.0
Week 44: Challenge Solution Video Creating Order IDs
Week 45: Challenge Solution Video Strange Table Structure
Week 46: Challenge Solution Video Dynamically Fixing Table Structures
Week 47: Challenge Solution Video Chelsea Managers per Prime Minister
Week 48: Challenge Solution Video Tiddlywinks Tidy
Week 49: Challenge Solution Video Cleaning Status History (HR month)
2021
Week 1: Challenge Solution Video New Year, New Challenge
Week 2: Challenge Solution Video Bike Store Sales
Week 3: Challenge Solution Video Bike Accessory Sales
Week 4: Challenge Solution Video Bike Sales Targets
Week 5: Challenge Solution Video Dealing With Duplication
Week 6: Challenge Solution Video Comparing Prize Money for Professional Golfers
Week 7: Challenge Solution Video Vegan Shopping List
Week 8: Challenge Solution Video Karaoke Data
Week 9: Challenge Solution Video Working with Strings
Week 10: Challenge Solution Video Pokemon Hierarchies
Week 11: Challenge Solution Video Cocktail Profit Margins
Week 12: Challenge Solution Video Maldives Tourism
Week 13: Challenge Solution Video Premier League Statistics
Week 14: Challenge Solution Video Prep Air In-Flight Purchases
Week 15: Challenge Solution Video Restaurant Menu & Orders
Week 16: Challenge Solution Video The Super League
Week 17: Challenge Solution Video Timesheet Checks
Week 18: Challenge Solution Video Prep Air Project Overruns
Week 19: Challenge Solution Video Prep Air Project Details
Week 20: Challenge Solution Video Controlling Complaints
Week 21: Challenge Solution Video Getting Trolleyed
Week 22: Challenge Solution Video Answer Smash
Week 23: Challenge Solution Video NPS for Airlines
Week 24: Challenge Solution Video C&BS Co: Absence Monitoring
Week 25: Challenge Solution Video The Worst Pokemon
Week 26: Challenge Solution Video Rolling Weekly Revenue
Week 27: Challenge Solution Video NBA Draft Lottery calculator
Week 28: Challenge Solution Video It's Coming Rome
Week 29: Challenge Solution Video PD x WOW - Tokyo 2020 Calendar
Week 30: Challenge Solution Video Lift Your Spirits
Week 31: Challenge Solution Video Excelling in Prep
Week 32: Challenge Solution Video Excelling through aggregation
Week 33: Challenge Solution Video Excelling at adding one more row
Week 34: Challenge Solution Video Excelling with lookups
Week 35: Challenge Solution Video Picture perfect
Week 36: Challenge Solution Video What's trendy?
Week 37: Challenge Solution Video Re-looking at phone contract revenue
Week 38: Challenge Solution Video Trilogy
Week 39: Challenge Solution Video Painting bikes
Week 40: Challenge Solution Video Animal adoptions
Week 41: Challenge Solution Video Southend Stats
Week 42: Challenge Solution Video Charity Fundraising
Week 43: Challenge Solution Video Is that the case?
Week 44: Challenge Solution Video On yer bike!
Week 45: Challenge Solution Video Spread the Knowledge for TC!
Week 46: Challenge Solution Video Bookshop Data Modelling
Week 47: Challenge Solution Video Games Night Viz Collab
Week 48: Challenge Solution Video Departmental December - Finance
Week 49: Challenge Solution Video Departmental December - Human Resources
Week 50: Challenge Solution Video Departmental December - Sales
Week 51: Challenge Solution Video Departmental December - IT
Week 52: Challenge Solution Video Departmental December - Operations
2020
Week 1: Challenge Solution Video Accounting Formatting
Week 2: Challenge Solution Video Cleaning Time
Week 3: Challenge Solution Video NBA Standings
Week 4: Challenge Solution Video C&BS Co: Store Survey deduplication
Week 5: Challenge Solution Video Technique: Standard Competition Rank
Week 6: Challenge Solution Video C&BS Co: Currency Conversion
Week 7: Challenge Solution Video Counting People Past & Present
Week 8: Challenge Solution Video Comparing Actuals vs Budget / Profitable levels
Week 9: Challenge Solution Video C&BS Co: Political Monitoring
Week 10: Challenge Solution Video C&BS Co: A Logic Grid Puzzle
Week 11: Challenge Solution Video C&BS Co: Knapsack Problem
Week 12: Challenge Solution Video C&BS Co: Messy Data Clean Up
Week 13: Challenge Solution Video C&BS Co IT: Analysing Support Desk SLA Compliance
Week 14: Challenge Solution Video Preppin' Data to Build a Spider Chart
Week 15: Challenge Solution Video Market Basket Analysis
Week 16: Challenge Solution Video Preppin' the un-Visualisable
Week 17: Challenge Solution Video Netflix Usage
Week 18: Challenge Solution Video Liverpool Line-ups
Week 19: Challenge Solution Video Liverpool Line-ups (Part 2)
Week 20: Challenge Solution Video Cipher Solving
Week 21: Challenge Solution Video Competitor Analysis
Week 22: Challenge Solution Video Creating Data
Week 23: Challenge Solution Video Let's Get Quizzical
Week 24: Challenge Solution Video Historical Battles
Week 25: Challenge Solution Video Roman Numerals
Week 26: Challenge Solution Video Matching IDs
Week 27: Challenge Solution Video Surf's Up!
Week 28: Challenge Solution Video Olympic Dates
Week 29: Challenge Solution Video Event Refunds
Week 30: Challenge Solution Video What's the Weather?
Week 31: Challenge Solution Video When PD met Workout Wednesday Again!
Week 32: Challenge Solution Video Fill Down Challenge
Week 33: Challenge Solution Video Fill Down Challenge 2
Week 34: Challenge Solution Video C&BS Co: Profitability Analysis
Week 35: Challenge Solution Video C&BS Co: Restructuring Excel data
Week 36: Challenge Solution Video Back to School: Teacher allocations
Week 37: Challenge Solution Video Working Days
Week 38: Challenge Solution Video Anagrams or Snag a Ram?
Week 39: Challenge Solution Video Prep a Manger
Week 40: Challenge Solution Video What Were William's Words Worth?
Week 41: Challenge Solution Video Tableau Conference-ish!
Week 42: Challenge Solution Video Progress to Date tracking
Week 43: Challenge Solution Video Baby Names
Week 44: Challenge Solution Video Spooky Sales
Week 45: Challenge Launching Prep Air
Week 46: Challenge Solution Video Aviation Incidents
Week 47: Challenge Solution Video Prep Air Delays
Week 48: Challenge Solution Video Gate Allocation Problem
Week 49: Challenge Solution Video NBA Rankings
Week 50: Challenge Solution Video Secret Santa
Week 51: Challenge Solution Video NBA Travel Times
Week 52: Challenge Solution Video US Women's Championship Golf
Week 53: Challenge Solution Video Changing Star Signs
2019
Week 1: Challenge Solution What colour cars are selling?
Week 2: Challenge Solution Windy, wet or both?
Week 3: Challenge Solution Mobile phone contract revenue
Week 4: Challenge Solution NBA player profile (pane) analysis
Week 5: Challenge Solution Balances, statements, and complaints
Week 6: Challenge Solution C&BS Co: purveyors of soap
Week 7: Challenge Solution C&BS Co: bubbling distribution problems
Week 8: Challenge Solution C&BS Co: accounting for slippery thieves
Week 9: Challenge Solution C&BS Co: scouring Twitter feedback
Week 10: Challenge Solution C&BS Co: freshening up a mailing list
Week 11: Challenge Solution Parsing JSON data
Week 12: Challenge Solution C&BS Co: sanitizing system downtime
Week 13: Challenge Solution C&BS Co: sniffing out balance issues
Week 14: Challenge Solution Meal deals at Whyte's Cafe
Week 15: Challenge Solution Finding weird client behaviour
Week 16: Challenge Solution C&BS Co: a 15 perScent discount!
Week 17: Challenge Solution Arrow's Impossibility Theorem
Week 18: Challenge Solution C&BS Co: Endless Legend of the Soap Heroes
Week 19: Challenge Solution C&BS Co: mud, sweat, & bicycle gears
Week 20: Challenge Solution C&BS Co: paying for hospital scrubs - Part 1
Week 21: Challenge Solution C&BS Co: paying for hospital scrubs - Part 2
Week 22: Challenge Solution Calculating a moving average
Week 23: Challenge Solution Creating TitleCase Text
Week 24: Challenge Solution What's up with WhatsApp?
Week 25: Challenge Solution When PD met Workout Wednesday
Week 26: Challenge Solution No typed calculations allowed!
Week 27: Challenge Solution C&BS Co: Valentine's analysis
Week 28: Challenge Solution C&BS Co: People time recording
Week 29: Challenge Solution C&BS Co: Subscription package financial model
Week 30: Challenge Solution Serpentine Swimming Club
Week 31: Challenge Solution C&BS Co: Orders and Operational Stats
Week 32: Challenge Solution C&BS Co: Multiple products, multiple columns
Week 33: Challenge Solution C&BS Co: HR data from multiple sources
Week 34: Challenge Solution C&BS Co: Supplier Timings part I
Week 35: Challenge Solution C&BS Co: Supplier Timings part II
Week 36: Challenge Solution Reusable Steps - Metric Conversion
Week 37: Challenge Solution Aggregations, aggregations and more aggregations
Week 38: Challenge Solution Health in Harmony challenge
Week 39: Challenge Solution C&BS Co: Web Analytics
Week 40: Challenge Solution Sudzilla Conference Survey results
Week 41: Challenge Solution C&BS Co: Complaints and Returns
Week 42: Challenge Solution C&BS Co: International Expansion
Week 43: Challenge Solution C&BS Co: End of Year Store Targets
Week 44: Challenge Solution C&BS Co: End of Year Team Member Performance
Week 45: Challenge Solution C&BS Co: Duplication and So, So Many Files
Week 46: Challenge Solution Naughty & Nice List