by Chris Webb | Dec 17, 2023 | Chris Webb
One of the coolest features in Fabric is Direct Lake mode, which allows you to build Power BI reports directly on top of Delta tables in your data lake without having to wait for a semantic model to refresh. However not everyone is ready for Fabric yet so there’s also...
by Chris Webb | Dec 10, 2023 | Chris Webb
Something I mentioned in my recent post about the new DeltaLake.Tables M function on the Fabric blog recently was the fact that you can get different versions of the data held in a Delta table using the Value.Versions M function. In fact, the Value.Versions is the way...
by Chris Webb | Dec 3, 2023 | Chris Webb
Power Query allows you to merge (“join” in database terms) two tables together in a variety of different ways, including left and right anti joins. Unfortunately, as I found recently, anti joins don’t fold on SQL Server-related data sources, which can result in...
by Chris Webb | Nov 26, 2023 | Chris Webb
A lot of DAX performance problems relate to the use of strict and eager evaluation with the IF or SWITCH functions. It’s an incredibly complex, “it depends”, black-box type of topic and naturally Marco and Alberto have a great article on it here. Rather than describe...
by Chris Webb | Nov 18, 2023 | Chris Webb
Last week it was announced that Power BI datasets have been renamed: they are now semantic models. You can read the announcement blog post here and see the change in the Fabric/Power BI UI already. The name change proved to be surprisingly uncontroversial. Of course...
by Chris Webb | Nov 12, 2023 | Chris Webb
Excel workbooks are one of the slowest data sources you can use with Power Query in Excel or Power BI. Reading small amounts of data from small workbooks is usually fast; reading large amounts of data from large workbooks can be very slow. But what about reading small...
