59 articles tagged #Excel
Accidentally overwriting worksheets is one of the most common mistakes when using Python's openpyxl library. Whether you're appending reports, updating existing workbooks, or generating automated spreadsheets, understanding how openpyxl handles workbook saving can prevent costly data loss.
Getting a #VALUE! error from XLOOKUP when your return array spans multiple columns? This is a common spill behavior trap. Learn exactly why it happens and how to fix it in a few keystrokes.
COUNTIFS applies AND logic by default, so combining OR conditions inside one formula silently undercounts your data. Here's exactly why it breaks and four reliable patterns to fix it.
XLOOKUP silently returns wrong values when your search array contains merged cells — not an error, just the wrong answer. Here's exactly why it happens and how to fix it for good.
Your INDEX MATCH formula works fine on a single column but throws #VALUE! the moment you extend it across multiple columns. Here's exactly why that happens and the precise fixes to make it work.
VLOOKUP always returns the first match it finds — so when your lookup table has duplicate keys, you get the wrong value with no error to warn you. Here's how to diagnose the problem and fix it for good.
AVERAGEIFS throws #DIV/0! and your named range looks perfectly fine — so what's going wrong? The culprit is usually a size mismatch or scope conflict that Excel silently fails on. Here's how to diagnose and fix it.
Your SUMIF looks right, your criteria is correct, but the total is off — and the only thing that changed was filtering or hiding some rows. Here's exactly why SUMIF ignores your hidden-row expectations and how to fix it.
COUNTIFS with date ranges looks right but counts wrong — a frustrating bug that hides in plain sight. Learn exactly why Excel misreads your date criteria and the fixes that actually work.
Your INDEX MATCH formula looks perfect but keeps throwing #N/A — and the culprit is a merged cell in your lookup range. Here's exactly why this breaks and how to fix it without losing your layout.
Excel's AVERAGEIF throws a #DIV/0! error the moment its criteria match zero cells — even a single filter or typo can trigger it. Here's how to diagnose the root cause and wrap it safely.
Your VLOOKUP keeps showing yesterday's values even after you've updated the source table. Here's exactly why that happens and the steps to force Excel to recalculate — or replace VLOOKUP with a formula that handles it cleanly.