Free Data Cleaning Lab
Clean dirty data like the job actually requires
Cleaning messy data is most of the analyst job, so this is the hands-on drill: download a genuinely dirty dataset, clean it in the required tool (Excel or SQL), and answer scored questions while the stakeholder reacts. Two Excel scenarios, two SQL scenarios, 20 questions. No hand-holding: the full answer key, with the formula or query for each and a note that other approaches work too, appears at the end.
4
Scenarios
20
Questions
Excel + SQL
Tools
Downloadable
Datasets
Every dataset is genuinely messy, the way real exports arrive: duplicates, placeholder nulls, mixed formats, text stored as numbers, orphaned records, and impossible values. Every answer is checkable from the file you download, and every wrong option is the exact number you get when you skip a cleaning step.
Ready to clean real client data with a mentor watching?
The bootcamp drills data cleaning on larger, messier datasets and turns it into a portfolio, live, with feedback.