When you merge two tables in Power Query, the result may contain fewer rows than the left table. This happens because the default join kind is a left outer join, which only keeps rows from the left table that match at least one row in the right table. If the right table has duplicate keys … Read more
You built a PivotTable in Excel, added new rows of data to the source range, refreshed the PivotTable, but the new data does not appear. The source range has shrunk or stayed the same size instead of expanding to include the new rows. This happens because Excel stores the source range as a static reference … Read more
The Excel FILTER function returns an empty result or a #CALC! error when you try to filter for blank cells. This happens because the FILTER function treats blank criteria as no criteria at all and returns all rows from the source array. You need a specific workaround to make FILTER recognize and return only blank … Read more
You add a new entry to your source range, but the dropdown list in your Excel worksheet does not update. The drop-down still shows only the old items, and new cells you try to validate against the list fail. This happens because data validation lists are static by default: they reference a fixed cell range, … Read more
When you delete data from your source table and refresh a PivotTable, the filter drop-down list may still show old items that no longer exist. This happens because Excel caches the unique values from the original data range inside the PivotTable cache. The stale items can clutter your filter list, making it harder to find … Read more
You use XLOOKUP in Excel expecting the correct match, but it returns the wrong value when your lookup column contains duplicate keys. This happens because XLOOKUP by default returns the first match it finds, and when duplicates exist, the first match may not be the one you intended. In this article, you will learn why … Read more
You apply conditional formatting to a column in Excel, then sort the data, and the formatting no longer matches the correct rows. The rules you set up seem to shift or disappear. This happens because conditional formatting rules can reference absolute cell ranges instead of relative positions. This article explains why sorting breaks conditional formatting … Read more
When you ask Copilot in Excel to summarize, filter, or sort a range of cells that is not formatted as an Excel table, Copilot responds with an error message stating it cannot analyze data outside a table. This limitation exists because Copilot relies on the structured reference system that tables provide to understand column headers … Read more
Microsoft 365 Copilot requires your data to be in an Excel table before it can analyze, summarize, or generate insights from it. If you have a standard range of cells, Copilot will not activate its analysis features, and you may see a message asking you to convert the range first. This article explains exactly how … Read more
Excel filters can stop working when your data range has formatting or structural problems. The most common causes are merged cells in the header row or blank rows within your data set. This article explains how to identify and fix these specific issues to restore your filter functionality. Key Takeaways: Fixing Excel Filter Problems Data … Read more