XLsheetAI
Excel & Google Sheets guides
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AI
Excel Copilot vs ChatGPT
Copilot can see your workbook; ChatGPT cannot. That one difference decides which tool to reach for — and where each quietly gets things wrong.
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Formulas
Dynamic Arrays: FILTER, SORT, UNIQUE
One formula, many cells. How spilling works, what actually causes #SPILL!, and the # operator nobody explains.
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Performance
Why Is My Excel File So Slow?
Eight causes ranked by how often they actually bite — volatile functions, whole-column references, runaway formatting — and the fix for each.
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AI
Cleaning Messy Data with AI
Let AI write the transformation, never let it be the transformation. Where the line falls, and how to check the work.
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Workflow
Power Query or Formulas?
One is recorded once and replayed with a refresh; the other reacts live on the sheet. The dividing line is repetition and shape.
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Lookup
Excel Lookup with Multiple Criteria
When your lookup has to match product and region: the helper-key method, FILTER, XLOOKUP with a multiplied array, and why SUMIFS quietly gives wrong answers.
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SQL
Window Functions vs GROUP BY
One collapses your rows, the other keeps them. The test that settles which to use, plus running totals, ranking, and why you cannot filter a window in WHERE.
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Power BI
Why Your Measure Ignores the Slicer
The same number in every row is not a bug — something removed the filter context. What CALCULATE, ALL and ALLSELECTED actually do, and a three-step debugging order.
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Translation guide
Excel to DAX: The Formula Translation Guide
Every common Excel formula mapped to its DAX equivalent, plus the row-context-vs-filter-context shift that actually explains why they don't map 1:1.
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Translation guide
Excel to SQL: The Formula Translation Guide
VLOOKUP to JOIN, SUMIFS to GROUP BY, pivot tables to aggregates — plus the JOIN pitfall that silently duplicates rows and has no Excel equivalent.
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Comparison
Excel vs Power BI: Which One Do You Actually Need
What each tool is built for, real cost differences, and a task-by-task breakdown so you stop guessing which one your team needs.
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How-to
How to Export SAP Data to Excel (Without Breaking It)
Five real export methods, plus the leading-zero, text-vs-number and refresh problems that quietly corrupt SAP reports in Excel.
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Listicle
20 Excel Formulas That Feel Like Cheat Codes
Ranked by difficulty tier, from everyday power moves to Microsoft 365-only sorcery, with exact syntax and worked examples.
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Deep dive
Spreadsheet Errors That Cost Millions: 8 Verified Cases
From JPMorgan's VaR model to 15,841 COVID cases lost to a row limit: the exact mechanism that failed each time, checked against primary sources.
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Comparison
Excel vs Google Sheets in 2026
An honest verdict on collaboration, scale limits, automation, AI features and price, with a straight answer for each kind of team.
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Formulas
Excel Formulas Cheat Sheet
Every formula that earns its place in daily work, with correct syntax, worked examples and the error codes that trip people up.
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Lookups
XLOOKUP vs VLOOKUP: Which Should You Use?
A straight comparison of both lookups plus INDEX+MATCH, with a migration guide and the compatibility traps to watch for.
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Data entry
How to Convert an Image to Excel
Turn a photo or screenshot of a table into an editable spreadsheet, and know which method to reach for in each situation.
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Logic
Excel IF Formula Examples
Worked IF examples on one dataset, plus IFS, AND/OR combinations and the point where nesting stops being worth it.
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Cleanup
How to Remove Duplicates in Excel
Find, highlight and delete duplicate rows without losing data, plus hidden traps like trailing spaces and text-formatted numbers.
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Analysis
How to Create a Pivot Table in Excel
Build your first pivot in minutes, then practical recipes: totals by region, date grouping, percentages, slicers and more.
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