December 2019
Beginner
370 pages
8h 9m
English
book
Tableau Desktop Certified Associate: Exam Guide
by Dmitry Anoshin, JC Gillet, Fabian Peri, Radhika Biyani, Gleb Makarenko
Content preview from Tableau Desktop Certified Associate: Exam Guide
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Using the Lookup function
When Tableau computes a table calculation for Percent Difference against the previous value, it actually uses one base table calculation function inside a more complicated calculation. If you wanted to drag and drop a Percent Difference calculation into the Dimensions pane and later Edit that calculation, the resulting formula would look something like the following (simplified for our purposes):
( (SUM([Sales]) - LOOKUP(SUM([Sales]), -1) ) / LOOKUP(SUM([Sales]), -1)
Here, we can see that we are making the most of a function called LOOKUP(expr, offset), which returns the value of the calculation specified by expr in a given cell, and more specifically of LOOKUP(expr, -1) to grab the results of the expression in the ...
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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.
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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.