This guide explains how to connect Excel and CSV files into Power BI, emphasizing import behavior, common pitfalls, Power Query best practices, and practical steps for combining and refreshing file-based data. It provides comparisons between Excel and CSV, common errors and fixes, and recommendations for storage and refresh in Power BI Service.
Connecting to Excel and CSV Files — The Practical, Slightly Theatrical Guide
You already know the Power BI stage: datasets, reports, dashboards. Now let’s invite Excel and CSV to the party — but politely. They can be messy guests if you don’t set rules. This lesson builds on what you learned about Import vs DirectQuery vs Live Connection and the core Power BI concepts. Qu...
Why this matters (and why you’ll thank me later) Most analysts start with Excel or CSVs. If you can’t connect to them cleanly, nothing else matters. Small mistakes at the import step compound. Bad headers, wrong data types, and merged cells will haunt your visuals. Refresh behavior is differ...
Quick step-by-step: Connect to a single Excel or CSV file Open Power BI Desktop. Click Get data -> Excel or Text/CSV . Browse and select the file. Click Open . In the Navigator, preview available sheets, tables, or the CSV preview. Select what you want. Choose Load (if you trust it) or T...
Excel vs CSV — quick comparison Feature Excel (.xlsx) CSV (.csv) Supports multiple sheets & named tables ✅ ❌ Preserves formatting/metadata ✅ ❌ Simpler to inspect for humans ✅ ✅ (but raw) Ideal for direct import into Power BI ✅ (use Tables/Named Ranges) ✅ (good ...
Power Query rituals (the sacred steps you will thank me for) Promote headers properly: If first row is header, use the Promote Headers button. If not, create meaningful column names. Set data types early : Dates as Date, numbers as Decimal/Whole, text for IDs (preserve leading zeros!). Remove...
Combining many CSVs (the magical Folder connector) Want to stitch together 12 monthly CSVs into one table without copy-pasting? Use: Get Data -> Folder -> point to the folder with all CSVs. Click Combine & Transform Data . Power Query samples the first file, then generates steps t...
Common pain points & fixes (you will encounter these) Headers repeat every 50 rows : That’s an export quirk — remove rows that match header pattern or filter. Dates imported as numbers or wrong locale : Set Locale in the source step or change type using the correct locale. Leading zeros d...
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