March 2018
Beginner to intermediate
638 pages
16h 29m
English
Content preview from Mastering Microsoft Power BI
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DirectQuery dataset queries
For DirectQuery datasets, every M query is folded to exclusively utilize the resources of the single data source. Therefore, certain M functions and query logic that lack an equivalent SQL expression for the given data source, such as Oracle or Teradata, are not supported. In these scenarios, the dataset designer can develop alternative M queries that produce the same target data structure and are supported by the source system or implement the necessary logic within the layer of SQL views supporting the dataset.
An additional and fundamental limitation to the scope of M queries for DirectQuery datasets is the impact on query performance and user experience. Since the SQL statements representing M queries must ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.