This lesson explains how to connect Power BI to relational databases, covering connectors, authentication and gateways, query folding, DirectQuery considerations, best practices, and a hybrid real-world strategy. It combines practical steps, performance guidance, and hands-on next steps to help you build reliable, performant database-backed reports.
Connecting to Relational Databases (Power BI) You know how Excel and CSV files feel like cosy little cottages? Relational databases are the sprawling city with layers, traffic rules, and sometimes a grumpy mayor named Locking. Welcome. This lesson builds directly on what you already learned abou...
Why this matters (and why it will haunt your dreams in the best way) Relational databases are where most enterprise data lives. If you can’t get to them reliably, your shiny dashboard is just wishful thinking. How you connect affects performance, refreshability, governance, and security. Rememb...
Common relational connectors (who’s at the party) Connector Native in Power BI? Supports DirectQuery? Quick notes SQL Server Yes Yes Best integration, supports Windows/Database/Azure AD; native query folding is excellent. Azure SQL Database / Azure Synapse Yes Yes Cloud-na...
Step-by-step: Connect to a SQL Server (the canonical example) In Power BI Desktop: Home → Get data → Database → SQL Server database . In the dialog: Server : servername\instance or servername,port Database (optional): type database name to limit Navigator results Data connectivity mode : ...
Authentication & gateway: because the cloud can’t magically reach your office server Authentication options: Windows/Integrated , Database (username/password) , Microsoft account/Azure AD depending on connector. If your database is on-premises and you publish reports to Power BI Service: ...
Query folding — what it is and why it matters Query folding = Power Query's ability to translate your transformation steps back into SQL that runs on the database. Imagine: you ask Power BI for coffee, and instead of grinding beans locally, it tells the coffee machine to do it — much faster. ...
DirectQuery and modelling caveats In DirectQuery, calculations run on the source or as queries against it — so indexing matters, and bad model design = slow reports. Cross-database joins in DirectQuery can be limited; composite models and relationships have constraints depending on connector. ...
Real-world example (mini-case) Company X has 500M rows of orders in OrderDB . They need dashboards showing last 90 days near real-time and historical trends. Strategy: Create a filtered view vw_RecentOrders for last 90 days — used in DirectQuery for live KPIs. Import aggregated historical d...
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