Lookups · 7-minute guide
Fix missing VLOOKUP or XLOOKUP matches caused by data type mismatches, spaces, wrong ranges and approximate settings, with a reproducible Calc example.
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Counting and criteria · 7-minute guide
Diagnose COUNTIF mistakes from hidden spaces, numeric/text mismatches, date criteria and range alignment, with a reproducible Calc example.
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Data types · 7-minute guide
Distinguish numeric values from text identifiers, repair calculations and preserve leading-zero product codes across spreadsheet imports.
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CSV and dates · 8-minute guide
Diagnose date-like strings, ambiguous regional dates, incorrect CSV auto-conversion and true date values using a controlled Calc ISO-date example.
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Text extraction · 8-minute guide
Choose between splitting columns, extracting text after a delimiter and matching a regex pattern without losing leading-zero identifiers.
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Software compatibility · 8-minute guide
Diagnose formula errors after moving files between LibreOffice, OpenOffice, Gnumeric, PlanMaker, ONLYOFFICE, Apple Numbers, Calligra and Zoho Sheet.
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Most spreadsheet problems don’t begin with a function name. You notice something wrong: a lookup returns no match, an imported code loses its zeros, a count disagrees with the visible rows, or a formula works in one program but not another.
Start with the symptom. Each guide below gives you a short diagnosis, reproducible example, a safer correction, and links to the relevant function reference. We distinguish independently checked outcomes from testing performed inside the named spreadsheet application.
How to avoid making the problem worse
- Keep the original file. For CSV problems, do not overwrite the source until you know which fields are text and which are numbers or dates.
- Check the underlying value. The visible cell format is not necessarily the cell’s data type.
- Fix one representative row first. Test your correction before copying it to thousands of rows.
- Confirm your software and release. Spreadsheet applications can use different syntax, matching rules, array behavior, and import dialogs.
- Only then apply the fix broadly. Keep a before/after column or a copy so you can verify the results.
For independent checks of a local CSV, use the CSV Import Doctor. For formula moves between programs, start with the Formula Migration Helper or detailed compatibility comparisons.
Have a different problem?
Try the broader Guides by Task or search the site’s function directories. A missing published guide is not proof that your application does not support the function. If a guide is incorrect, send a specific example.