Excel · practical guide
Remove Duplicates in Excel Without Deleting Good Data
The same total and row count can hide repeated and missing invoices. Flag the keys before deleting.
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Try the Excel guides with synthetic data, check the answers, then adapt a copy for your own work.
Seventeen sheets bring the source rows, checks and results together.
Macro-free XLSX. No configured external connections. Your original files are not part of this download.

The free exercise is separate from the invitation-only $5 Report Tools Starter Kit. No payment or signup is needed for these files.
Three starting CSVs, a held-out fourth file, an optional Power Query recipe and a source-count checklist.
Expected controls: 3 files → 6 rows → 2,100. Add the fourth file: 4 files → 8 rows → 3,600. Keep invoice codes as text and source filenames attached.
Download the file exerciseThe optional recipe is reviewed against Microsoft documentation. Native Excel Power Query execution is not yet verified; the shared workbook has no embedded external connection.
Keep twelve Windows desktop shortcuts beside the task: make a Table, filter, move, edit, fill and format.
Download the printable referenceFormula results and PivotTable refresh were checked in LibreOffice 26.8. XLOOKUP requires Microsoft 365 / Excel 2021 or later; a VLOOKUP alternative is included. Native Excel menu and refresh verification remains pending.
Need to prepare your own export? Combine CSV/TSV files or pasted cells in the private list workspace. Keep the source rows and save a result on your device.
Try the private list toolExcel · practical guide
The same total and row count can hide repeated and missing invoices. Flag the keys before deleting.
Read the guideExcel · practical guide
Find missing IDs and repeated keys with exact-match lookups, plus an older-Excel alternative.
Read the guideExcel · practical guide
Keep source filenames, set types deliberately and check six rows becoming eight.
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