Part 6/8:
DAX (Data Analysis Expressions) is crucial in Power BI, allowing users to create measures and calculated columns for analysis, while SQL is primarily focused on querying.
Key Differences:
DAX is optimized for data modeling and aggregations.
SQL queries are straightforward data retrieval commands.
Live Connections vs. Extract Connections
Another technical aspect involves discussing live and extract connections:
Live Connection: Directly connects to a data source and fetches real-time data.
Extract Connection: Pulls a snapshot of data; suitable for large datasets but not updated in real-time.