Free workplace practice · No account needed
Clean a file, reconcile refunds, investigate stock or prepare an evidence handoff. Build a deliverable you can check and download.
Find your next projectSELECT order_id, amount FROM orders WHERE status = 'paid' AND amount > 100;
| order_id | status | amount |
|---|---|---|
| 1 | paid | 120 |
| 2 | pending | 140 |
| 3 | paid | 100 |
| 4 | paid | 180 |
Start with a deliverable
CSV / spreadsheet · About 25 minutes
Clean 68 fictional order records, account for conflicting keys and invalid dates, and deliver a checked CSV with a review note.
Clean order CSV + exclusion checklist + checked handoff report
Open the task brief →SQLite · About 35 minutes
Reconcile paid sales and posted refunds with SQLite. Handle repeated receipts, orphan refunds and over-refunds before exporting a regional ledger.
Replayable SQL + regional ledger CSV + reconciliation report
Open the task brief →Guided review form · About 10 minutes
Compare an overstated pilot summary with three source notes. Enter supported findings in plain fields and download a checked evidence handoff.
Corrected results fields + cited source IDs + review handoff
Open the task brief →Choose a finished piece of work, then practice the steps to make it.
8 courses
A clean order CSV with a reconciled exclusion count
Clean and reshape messy sales data for a reliable handoff.
A regional sales CSV with checked counts and totals
Build a checked sales report with lookups and conditional totals.
A SQL paid-order report with NULL and date checks
Write and run SQL queries to answer everyday business questions.
A net-revenue report with a refund exception audit
Diagnose funnels, refunds, inventory and duplicate customer records.
An evidence-grounded pilot JSON and source manifest
Check AI-assisted work against evidence and a clear output contract.
A regional gross/refund/net ledger and exception SQL
Reconcile paid sales to posted refunds without duplicate-key or join inflation.
A pack-rounded replenishment CSV with recount and reservation exceptions
Turn stock snapshots and inbound orders into a checked replenishment queue.
An SLA review CSV with evidence IDs and ordered follow-up actions
Check response deadlines and attach verifiable receipts to a support handoff.
Try another deliverable, allow more time or clear your filters.
Practice selected data-preparation goals through four original lessons, a checked order-file project and all the materials.
Explore the data-preparation trial →