Twelve lessons on DirectQuery alone — Power BI querying a source live rather than importing a copy of it.
Narrow on purpose, and the narrowness is the value. DirectQuery is chosen when the data is too large to import or has to be current to the second, and it changes what is possible: some DAX stops working, performance depends on the source rather than on Power BI, and modelling choices that are free in import mode become expensive.
Under an hour. Take it when the decision between import and DirectQuery is actually in front of you, not before.
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100 lessons, about 20 hours
A 100-lesson playlist on Power BI, about 20 hours, published on YouTube by Amit Chandak. Watched here on the course page.
1 lesson, about 4 hours
A single session on databases, about 4 hours, published on YouTube by edureka!. Watched here on the course page.
56 lessons, about 40 hours
A 56-lesson playlist on Power BI, about 40 hours, published on YouTube by edureka!. Watched here on the course page.
44 lessons, about 6 hours
A 44-lesson playlist on Power BI, about 6 hours, published on YouTube by Enterprise DNA. Watched here on the course page.
12 lessons, about 2 hours
A 12-lesson playlist on Power BI, about 2 hours, published on YouTube by Guy in a Cube. Watched here on the course page.
44 minutes
A 44-minute video from Jim Pytel.
56 lessons, about 40 hours
A 56-lesson playlist on Power BI, about 40 hours, published on YouTube by edureka!. Watched here on the course page.
44 lessons, about 6 hours
A 44-lesson playlist on Power BI, about 6 hours, published on YouTube by Enterprise DNA. Watched here on the course page.
12 lessons, about 2 hours
A 12-lesson playlist on Power BI, about 2 hours, published on YouTube by Guy in a Cube. Watched here on the course page.
