I'm tired of manually copying and pasting data every Monday morning. Is there a way to link an Excel dashboard directly to a SQL Server so that my charts and KPIs refresh with one click? I've heard about Power Query but I am not sure if it handles large datasets well or if it will slow down my entire workbook when the stakeholders open it.
3 answers
Power Query (M language) is absolutely the tool for this. You should go to Data > Get Data > From Database > From SQL Server. The beauty of Power Query is that it performs "Query Folding," meaning it pushes the data processing back to the SQL Server rather than doing it inside Excel, which keeps your file light. To prevent the workbook from lagging, ensure you load the data to the "Data Model" (Power Pivot) instead of a worksheet. This allows you to handle millions of rows while keeping the file size manageable. You can set the connection to refresh automatically upon opening the file or at specific intervals.
Does this method work if the SQL Server is behind a corporate firewall? I’ve had issues where the refresh works for me on my local machine but fails for my manager when I email them the file. Do they need specific drivers installed?
I've used Power Query for years. One tip: always use the "Table" format for your output. It makes your Pivot Charts much more stable when the data volume changes.
Great point, Steven. Kimberly, I'd also add that using "Parameters" in Power Query can help Karen's manager filter the SQL data by date range before it even hits the Excel sheet.
Thomas, they don't necessarily need drivers, but they do need network access to the server. If you're emailing the file, the connection will break. The best practice is to host the Excel file on SharePoint or OneDrive. This allows the "Power BI Service" or Excel Online to handle the credentials via a Gateway. Alternatively, you can use a "Flat File" export in a shared folder as a middle-man if your IT department is strict about direct database connections.